Brake pedal issue-----Solved!

Not finding any real clue as to the cause of the problem, and all parts being of questionable age and condition, I decided to replace it all!
Everything on the rear axle was changed when I bought the car as it had a leaking axle seal. All new rear brake parts were installed.
New Dorman MC, new distribution/proportioning valve from Dr Diff, new hoses, caliper rebuild seals and wheel bearings while it was all apart. The rotors were in good shape.
Got it all back together, fluid flushed and bled.
I have brakes, put you in the dash brakes!
I installed MOOG offset bushings in the UCA's and got the alignment done to the second line specs in the SKOSH chart.
That, and the upgrade to 892/893 torsion bars has made this /6 Valiant more comfortable and fun to drive!