Need help lost brakes

Ok so before I pulled the /6 out of my 73 duster the brakes were working great even for 4 wheels manual drums they worked great.I swaped to a 360 and we took the master cyalnder off and it set for a few weeks.We kept the rear drums but replaced them with all new parts.The front was still good so we just adjusted them.Also we replaced the rear with a 8 3/4.Now we blead the brakes twice but still have a soft pedal and poor brakes.What could it be.We dont have any notable leaks.