Brakes?

[71Custom10]

I recently replaced all my stock rubber lines with braided stinless steel lines. Bled brakes several times but still no brakes. Found a clogged rear wheel cylinder, replaced both, still no brakes. Pluged lines from m/c to check it and no good. Bench bled m/c, reinstalled with lines still plugged, still no good. Had a booster and m/c from 89 burb on the shelf in the shop, so i decieded to make the swap. everything installed and looking much better than the stock setup, plugged lines from m/c and it checks out ok(bench bled it prior to install also). Hooked up brake lines and bled the system several times. I now have brakes but the pedal is very soft. It feels like there are no brakes at all but the truck stops fine. I would prefer a little more stiffness in the pedal. Brakes were fine before I decieded to replace the rubber lines, they were looking pretty bad. Please help, I'm starting to lose my mind.
'72 1/2 ton disc/drum Thanks