9" drums all around...not diggin' it!

Scarebird makes an adapter bracket for $105 that allows you to convert to disk brakes using late model GM calipers and re-drilled toyota rotors, they also sell a complete kit for $495, it is usually cheaper to just buy the adapter bracket's (they come with a list of parts you need to complete the conversion) and just shop local for the rest of the parts
the set up works very well, I personally know two people using them, one on an A-body and one on a C-body
they have one kit for 10" drum spindles, and another one for 9" drum spindles

http://www.scarebird.com/index.php?id=30