No way this car weighs 2975. That must be a feather Duster with /6 and 7 1/4 rear.
My '74 duster with the 318 is lighter and it weighed 3180 with 1/4 tank of gas (no driver). It does not have the "shock" bumper in the front like my '76. It has a 7 1/4 rear end. Smaller 14" rims/tires in back. No stabilizer bar. Drum brakes in the front. /6 torsion bars.
Naw, I'd be lucky if my '76 was 3300 by itself, but might be closer to 3400. I'll weigh it sometime and post it.