Just found this thread, nice truck.
I have a 62 K10 that I put power brakes in, first I found an original booster then later I put on one with a split system from a 71 3/4 ton, bolted right up. I have an automatic so the clutch master was not a problem with the later booster but I am pretty sure that the mechanical clutch linkage from later trucks will bolt right in with the correct selection of parts. That way you can keep your manual trans if you want to and still use a later booster. I put on front discs from the later truck at the same time, 1/2 ton, not 3/4.
Hope things are going well.
