284 484 cam and power brakes
The thing is if you are going to swap to manual brakes why not upgrade to the aluminum M/C that has a bigger bore and better pedal feel and more pressure......that old 4-bolt M/C is junk IMO unless you are going for the un-molested factory look or numbers matching. With the upgraded M/C the manula brakes are better than the power brakes could ever be. Hell I think the manual brakes on my car with the aluminum M/C are better than the hydro boosted brakes on my 3/4 truck and I have them upgraded for towing and such.