Rear brake drums

not outside the realm of possibility I suppose. The 10x2.5" and all the 11" brake varieties (11x2, 11x2.5, 11x3) can all be used on BBP axles as long as the right backing plates are used.

It shouldn't have the 9" brakes, all the V8 cars got disks up front starting in '73, and all the disk cars were BBP. The 9" drums would have been SBP and should only have come on 4 wheel drum cars.