maybe in canada, but in the usa 73-76 with A/C got bbp disc brakes (B43),4 wheel drum cars were always small bolt pattern and were standard with the slant 6,disc brakes were an option on all 73-76 slant 6 cars, and were standard on V8 cars....also 318 with A/C got mandatory power disc brakes... also not all a bodies with BBP had 8.25 rears lots still had BBP 7.25 rears.