OK, here's the final rules. We've opened it up so that Nostalgia Hemi SS/AA cars can compete without changing their grille and tail panel. Keep in mind, these rules are mainly a reminder of NHRA safety requirements. The other guidelines are to prevent this from becoming a class of bracket bombers (no offense to grass roots bracket racers ).

Nostalgia Pro Stock

1. Classes:
Open to vehicles formerly used in Pro Stock competition. Vehicles need not be authentic former Pro Stock cars. Clone cars acceptable. Tribute (period correct) cars acceptable. The following vehicles are eligible to compete:
Class I: 1968-70 AMC AMX, 1968-70 AMC Javelin, 1971-77 AMC Hornet, 1968-73 Chevrolet Camaro, 1968-74 Chevrolet Nova, 1968-72 Dodge Dart, 1970-74 Dodge Challenger, 1971-72 Dodge Demon, 1973-76 Dodge Dart Sport, 1970-77 Ford Maverick, 1968-70 Mercury Cougar, 1971-77 Mercury Comet, 1969-73 Ford Mustang, 1968-74 Plymouth Barracuda, 1970-76 Plymouth Duster, 1968-73 Pontiac Firebird.
Class II: 1970-78 AMC Gremlin, 1971-77 Chevrolet Vega, 1974-81 Chevrolet Camaro, 1975-80 Monza, 1971-78 Dodge Colt, 1976-80 Dodge Aspen, 1978-83 Dodge Challenger, 1978-83 Dodge Omni 024/Charger, 1971-79 Ford Pinto, 1974-81 Ford Mustang II, 1971-73 Plymouth Cricket, 1976-80 Plymouth Volare, 1976-80 Plymouth Arrow, 1978-83 Plymouth Horizon TC3/Turismo, 1974-81 Pontiac Firebird.
All vehicles must dial at an established class index during eliminations: (8.00, 8.50, 9.00, 9.50, 10.00). Contestants will qualify based on running closest to their index without running quicker, during time trials. Vehicles may not run quicker than their index during eliminations. Cars will be laddered beginning with the first round of eliminations.

2. Ballast:
Weight must be installed in acceptable weight box, installed in trunk and attached to the frame or cross member. No liquid or loose ballast permitted.

3: Body:
a. Class I: Minimum wheelbase 100 inches. Original steel body shell must be retained. Bodies in white acceptable. Alterations permitted if retaining an overall stock appearance. Excessive weight reduction must not be visible. Fiberglass or other lightweight body panels are allowed for front fenders, hood, doors, bumpers, splash panels, valance panels and deck lid.
Class II: Minimum wheelbase 92 inches. Original steel body shell required. Alterations permitted if retaining an overall stock appearance. Fiberglass or other lightweight body panels are allowed for front fenders, hood, doors, bumpers, splash panels, valance panels and deck lid.
b. Fender Splash Pans: Full inner panels are not required.
c. Firewall: Firewall may be moved rearward from stock location for engine installation. May be replaced with .028 inch steel or .040 inch aluminum.
d. Floors: May be replaced with .028 inch steel or .040 inch aluminum.
e. Frame: Class I: Back-halved cars only. Must use stock frame for car body used. Properly reinforced stepped frames permitted. Cross members may only be altered or relocated for engine or transmission clearance. Additional members may be added for roll cage installation. Class II: Back halved or tube chassis cars. Any properly reinforced frame permitted. Additional members may be added for roll cage installation.
f. Grille: Must be full production for make, model and year claimed. Covering in front of grille prohibited. Vehicle must retain stock head lamps, tail lamps and turn signals. Lights need not be operational.
g. Hood/Scoop: Hood required in all classes. Hood may be modified to clear intake manifold. Era-correct (snorkel, lump) hood scoop required. No “aero” scoops permitted.
h. Interior: Upholstered aftermarket front bucket type seats permitted (two required). Rear seat may be removed. Aftermarket replacement dashboard with aftermarket gauges allowed.
i. Paint: All cars must be painted in a style that reflects the era and paint colors available at the time. No primered vehicles. Decals and lettering must appear to be vintage. Contingency decals must represent products that are era correct.
j. Spoilers: OEM spoilers allowed. All rear spoilers other than those originally factory installed must not be more than four inches high and must be mounted behind the rear axle. Any rear spoiler must be integrated into the overall body design and be painted to match. No air dams.
k. Windows: Windshield and windows must be of safety glass, Lexan, Plexiglass, or other shatter-proof material. Windows not required to be operative.
l. Wheel Tubs: Wheel tubs of any size are allowed if legal wheels and tires are positioned in stock location relative to exterior body lines.

4. Brakes:
Brakes required on all four wheels. Aftermarket units allowed. Line-locks permitted.

5. Chassis:
Sub frames may be joined. Rear frame may be moved in or reconstructed for rear tire and wheel tub clearance. Roll cage required in all vehicles per NHRA General Regulation 4:11. Vehicles must have current NHRA chassis inspection sticker.

6. Drivetrain:
a. Any transmission with a maximum of four forward speeds and reverse allowed. Trans brake permitted with automatic transmission. Clutchless units accepted. Must remain in conventional location determined by engine used.
b. Rear End: Any rear end allowed, provided it was original equipment in an American production car. Aftermarket housings and axles, along with any gear ratio, are allowed.
c. Driveshaft Loop: Required.

7. Electrical:
Battery may be relocated. Electrically driven fans and water pumps permitted. Charging system not required.

8. Electronics:
a. The following electronics are not permitted; timed ignition interruption devices (stutter boxes), delay boxes, air and mechanical throttle stops, air shifters, dual line locks.
b. Computers and Data Recorders are allowed as long as they do not activate any function of the vehicle. Playback tachometers are allowed. No front wheel, hub or drive shaft pickups.
c. Electronic ignition components are permitted. Rpm limiters may be used for burnout and high side only, not as a launch device. 2 Step Module Selectors permitted with manual transmission only.

9. Engine:
a. Block: Restricted to original assembly line block or aftermarket replacement block. Must be same make as body used. Aluminum blocks allowed. Any displacement and internal modifications are allowed.
b. Carburetion: Limited to two four-barrel American automotive carburetors.
c. Cylinder Heads: Aluminum aftermarket heads allowed. Must retain original external overall appearance. Any internal modifications allowed.
d. Intake Manifold: Cast in-line dual four intake manifold required.
e. Oiling System: Dry sump systems permitted.
f. No power adders permitted.

10. Exhaust:
Open headers allowed.

11. Fuel:
Only gasoline fuel is permitted. Aftermarket fuel cells, electric fuel pumps and regulators allowed. No nitrous oxide.

12. Ignition:
Any aftermarket ignition systems, wiring and electronic conversion kits are allowed. See “Electronics” for additional restrictions.

13. Radiator:
Any size radiator in stock location allowed. 16 oz. catch can required.

14. Safety:
a. Helmets: Must meet SNELL or SFI 31.2A or 41.2A specifications. All helmets must have the appropriate certification sticker affixed inside the helmet.
b. Protective Clothing: Jacket and pants must meet SFI Spec 3.2A/5.
c. Seat Belts: Required in all vehicles. Three inch safety harness must meet SFI Spec 16.1 and be less than two years old.

15. Steering:
Stock type steering in conventional location required. Rack and pinion steering permitted.

16. Suspension:
Aftermarket front suspension permitted. Front suspension limiters permitted. Sway bar optional. Solid bushings in rear suspension allowed. Leaf springs may be moved inboard for tire clearance. Ladder bars or four-link rear suspensions allowed. Wheelie bars allowed.

17. Tires:
Front tires must have a minimum tread width of 4.5 inches. Rear slicks are permitted and are limited to a maximum side wall designation of 14.5 inches of width by 33 inches of diameter. Tire tread may not extend outside of fender. Maximum clearance between sidewall and body is 3 inches.

18. Weight:
Class I: Minimum weight 2400 pounds. Vehicle with 366 cubic inch engine or less may weigh 2100 pounds.
Class II: Minimum weight 2100 pounds.

19. Wheelbase:
Era-accepted modifications permitted.

20. Wheels:
Minimum 3.5 inches width required on the front. Any rear width is allowed as long as it fits under the stock wheel well opening.

21. Rule Discrepancy: In the event of a rule discrepancy or if a subject is not covered herein, defer to the current NHRA rule book based on vehicle Elapsed Time.

22. Technical Inspection: The guidelines set within, and the safety rules set forth by NHRA are intended solely as the minimum acceptable standards. Safety is the responsibility of the participant. Prior to competition, all vehicles and drivers must pass the host facility’s tech inspection. NHRA safety regulations supersede any and all other regulations. The final interpretation of any and all rules concerning safety is solely at the discretion of the host facility’s Tech Director. NNPSA makes no representations, warranties, or assurances that a technical inspection will: detect every problem with a vehicle or a driver’s personal equipment or clothing; detect every problem with rules compliance, or prevent injury, death or property damage. Non-safety related guidelines are set to ensure that vehicles represent the spirit of the class, not as a means of disqualification. All materials copyright 2009 Jeff Johnson and the National Nostalgic Pro Stock Association.