bolt pattern disc brake q

Jimacuda said
No such animal as a factory big bolt pattern 4 wheel drum brake A body.
All A body 4 wheel drum brake cars were small bolt pattern.
Only 73-up discs were large bolt pattern.

i saw 76 and i just figured it must be BBP
then i saw him looking for SBP discs, so to only thing that made sense to me was that he would have drums.