A Body axles 7 1/4 w/ 4 1/2 bolt circle

Any A-body, starting in 1973, that had front disc brakes would automatically be 4.5" bolt pattern. If that A-body had a 7.25" rear end, it would have the 4.5" bolt pattern in the back with 10" drums.
As an example, I have a '74 Plymouth Duster that is equipped with a 198 Slant 6 and auto transmission and 7.25 rear end. It was ordered with manual disc brakes in the front which came with 10" drums in the rear. Those disc brakes would mandate a 4.5" bolt pattern all around.