School me on adding brakes to my 8-3/4"

The most readily available big bolt brakes will be found under an F/M/J (Apsen/Volare/Fifth Ave./Diplomat/Gran Fury/etc.). Basically any car with the transverse torsion bars should have 10x2.5 rear drums. The 11" brakes are fine, but parts are harder to get and they are heavier. That hasn't stopped me from using them, though.