Cool, thanks for the update.
I think the 1976 K20 is supposed to be 1.25"
Anyway, this is half the battle, now we need to know if it actually solved the problem

Thanks,
Ran

Done! (well, mostly)

I got the 98 dodge MC installed. Had to hog out the holes and shorten the booster pushrod by about 1/4". Fittings were different so I ran new lines from the distribution block to the MC.

Got everything bled, and the pedal is back to normal; ~1/3 to 1/2 the pedal travel and it's firm. Doesn't seem to take excessive pressure on the pedal to stop either.

The rears lock up first. Haven't locked up the fronts yet. Sure seems to stop the 5600# truck a lot better though

I still have the stock distribution block installed (my FSM doesn't indicate that it has a proportioning valve in it or not?). I have a handheld IR temperature gun I used to make sure the rears aren't dragging.

Now all I need to do is find a friend to weld up the brackets I made for the e-brake cables and get that hooked up. Otherwise, I think I'll call the brakes done, and move on to my next project: the sloppy steering

Great!
Thanks for the update. I'll try the 98 Dodge MC and see if I can make it fit.

Thanks,
Ran