engine swap question

318 Darts came with 9" drums and 7-1/4" rears originally. I agree that they do need to be upgraded, though. My '64 273 GT Dart has gone through two 7-1/4" rears and after I "upgraded" to 10" drums, it still stopped like s#!t. I'm putting in an 8-3/4, big bolt discs, .99" torsions, and replacing all the other suspension stuff. It's all just nuts and bolts. I just picked up an A-518 trans. That's going to be fun fitting in there. There will be some cutting and welding involved in that upgrade.