I am going to be rebuilding my 340 due to it spinning a crank bearing, I think it was not put back together properly and the bearings weren't sized properly...Anyway, I'll give you the spec's it had and tell me what you would change and why. The reason I'm thinking my combo may be off is because when it was last together it had no umph off the line, couldn't even bark the tires, so something has to be off with this combo! Thanks in advance for your help!

71 Challenger
- 340-4bbl 727-auto
- Holley Avenger 770 carb
- Edelbrock Performer RPM dual plane intake
- 1-5/8" ceramic coated headers
- 8-3/4 sure grip 4.10:1 rear end (489 case)
- X-Heads machined & assembled by Herb McCandliss
- Mild port work
- 2.02-1.60
- Mopar Perf hydraulic rocker arms & springs
- Stainless steel valves
- Bored .030 over
- Steel crank
- Mopar Perf purple shaft cam 284/484
- Keith Black Sylvolite pistons (11:1 compression)
- Standard rods (shot-peened)
- Speed pro rings (file fitted)
- Double roller timing chain
- Miloden high volume oil pump
- Electronic ignition
- Light springs in distributor
- 8mm Morroso plug wires
- High fire Mopar Perf coil