ugly rear end

From my experience, all /6, front drum brake cars had the 4" bolt pattern. All of the 73 and later front disk brake cars, regardless of engine, had the 4½" bolt pattern. I have not seen a 73 or later V-8 car that did not have disk brakes, but that doesn't mean there aren't some out there.

The 7¼ was made with both SBP and BBP axles and was available with SG. From what I can determine, the 8.75 for the A-body was discontinued after the 340 was de-tuned beginning with the 73 models. So, there are no factory built A-body 8.75 differentials with BBP axles.