Hmmm, I don't recall having to cut studs, as it didn't matter, but Mike... yes flip what ever size zx booster and use what ever size master you can get your hands on(preferable with Toy calipers, 15/16). Without the clutch master in the way all boosters from 70-83 will fit and all masters are interchangable. If you want, PM me. I know I promised pics, but I do have time tomorrow. I'll take what ever pics you need of a zx booster installed in a early '74 and I have a '77 and a '79(2+2) in the driveway for reference pics. I did have a '81(2+2) parts car, but had to give it away.. minus the 20 minute engine/tranny pull, ofcourse.
JUST DO IT!