I am doing a similar setup on my 87 k5. It was factory 700r4/ np208, I swapped in a sm465 / np208 with a 88 up style bell(pass side slave) and put in a pedal setup from 84 earlier(linkage) truck. I was trying to use a clutch master cyl for 85 up truck/sub/blazer and attach the push rod to the clutch pedal. I drilled out a hole that I thought would give the right arc and stroke, but the problem is that the pedal is 2-3 inches to the pass side of where the clutch master rod is when straight. I know I could have it off a little, bout this much puts it in a bind.
How did you hook up your actuator rod to the pedal assy? Got a pic? I would really appreciate any more detail you could give me on this.