I need a small master cylinder with 7/8" bore

... these brakes were not cheap, altogether they were $1200 not including all the lines, fittings and other small parts I had to buy to get the system in. I have to say I'm disappointed with the tech support I've gotten from Wilwood ...
Ditto w/ the after-market Holley 2-D Pro-jection TBI kit I put on my 65 Newport in 1996 at $600 retail price. I never realized improved mileage or performance over the carburetor and it had many quirks that I never worked out, mainly from a bad fuel controls concept (no MAP or MAF sensor). Many people find it better to retro-mod w/ factory parts. In front brakes, those are advantages of using the 1973+ A-body setup (spindles, hub-rotor, calipers) or Scarebird's kit (custom mounting plate w/ GM caliper & Toyota rotor).