I'll post what I've got. It's no secret as its been posted on my website (now considered old fashined plain html) for years. For tech geeks its on my
Handling Theory & Data page 
Weighed at Englishtown (w/ 150 lbs. of tools) subtracting the tools.
1967 Barracuda Notchback, 340
3240 lbs.
Weighed in 2003 at 3201 lbs. 58 % on the front.
(For setting alignment I load the front seat with weights. Above weight was no driver.)
In terms of weight, the car is basically stock, plain jane with manual steering. Exceptions being aluminum intake & water pump and the wheels.
editWeight in 2003 was with 14" cast slot rims and street tires, 1/2 tank of fuel, spare.
In 2005, with new springs & t-bars, circle racing rims, Hoosier "Street TD" tires 245/50-15, full tank, no spare, was about 30 lbs less. After adjusting t-bars, the weight balance ended up 57.5% front with driver seated weighted, and 3310 lbs total.
Weighting the driver seat did not effect the fr/rr balance much, but did effect the side to side. So this was important to do before adjusting the t-bars and reattaching the sway bar links.
Stock Barracuda Wt & Wt Distribution from Published Data.1966 Barracuda S 3280 lbs. 56 % ft. (w/ driver) Road & Track
1966 Barracuda S 2820 curb, 3100 test 57 % ft. (w/ driver) Car & Driver
1967 NB 6 a/c 3280 curb, 3580 test, 58.9 % Car Life
1967 FB 273 p/b 3310 curb, 3720 test, 54.9 % Car Life
1969 FB 340 p/b p/s 3470 curb, 3650 test, 55.1 % (w/ driver) Car Life (car tested w/ K-H alum. rims)
1969 FB 440 3405 curb, 3740 test, 57.2 % (w/ driver) Car Life
1970 340 p/s p/b 3630 curb, 4020 test, 56 % (w/ driver) Car Life
1970 AAR 3585 curb 56.1 % Car Life
1972 340 p/s p/b 3520 curb 56.8 % Car & Driver
Magazine articles cited all reprinted in Brooklands Books Plymouth Barracuda
1964-1974Basically, of the Barracudas and Chllengers, a fastback second gen or first gen Barracuda is probably the best starting point in terms of front to rear balance. The first generation is the lightest starting point, and amongst the second generation notchbacks start lighter than the fastbacks.
For racing and autocross, its generally hard to get down to the minimum class weights especially if you're also working toward 50/50 balance. This is based on numbers I've seen from A and E body race cars.
