Great info here! Couple of things:
The 1975 Duster stripe could be had on a non-360 car. I had a 21k mile original slant 6 Duster with this stripe.
The lightweight (Feather, Lite) cars could be had with 318s and automatics - not all were slant 6 w/ overdrive.
Easy way to id a 1976 a-body: foot pedal parking brake, rearview mirror glued to windshield.
My 1975 Duster (sold it in 1996):
