67-72 Brake booster m/c guide

[Southedisto]

Alright, I have 72 Jimmy 4wd with disc front/disc rear (D60 front and 14b rear with 3/4ton calipers). 3/4t master cylinder, stock booster and p valve. I bench bled the master, pressure bled the calipers and guess what? I cant move the pedal!!! I removed the master cylinder and looked at the booster but cant see anything wrong. When I tried to reinstall the MC, it would go. So I loosened one front and one rear bleeder and it went on semi smoothly. What gives? Is my push rod to long? MC bad (brand new from partsAmerica) I was getting great flow with my pressure bleeder, but now..................I feel like tossing all of it and going to hydroboost!!! I have been battling this thing for a while now, motor running= nothing. Motor off= nothing!!! The booster check valve is good (mouth suck test)