Good point, I have a late 64 and it is a 3/4" cylinder. That seems to be the common break between early and late cars. Your suggestion sounds good. Mine is also a drum brake car and had the early style seats. All the brake and clutch cylinder parts are common Wagner items. I did the whole brake and clutch hydraulic system for less than 60 bucks including a hone. Shoes were 30 dollars for all 4 corners.

Phil, I may be in error on the slave cylinder material being iron though. It felt quite a lot heavier than a chunk of aluminum of that size. Even having sat for 18 years it had remarkably little corrosion. I may be just luckier than most.

Bottom line... these cars have a lot of rather pedestian parts that should not cost a lot to replace.