Only real thing wrong with drums in my case is the lack of them to begin with and them being made of "unobtanium".

If I can use the rotors and calipers from the 74 C10 I can also use the master cylinder and booster from the same.
I wouldn’t be shocked if they are the same as the Monte Carlo that they used on Bill’s.
GM being GM they have been known to use the same part on more than one thing.

Any kit using bolt on rotors will space the wheels out slightly

I’m going to do it the same way it was done on Bill’s