Chrysler's A-Body (Unibody) Changes 1967-76

LOTS of variations along the way:
Early ones had a smaller radiator opening, later ('73-'76) were opened up for a 26" rad.
A/C and non-A/C firewalls were different
LOTS of variations in dash frames
Minor differences in front/rear frame rails to accomodate impact bumpers
Floor pans modified in later years to accomodate catalytic converters
Torque plates added in hipo and convertibles
Wheelbase difference between different models
And many, many other running changes through the years...