Anyone ever eliminate the prop valve?

A few more nuggets:
The car currently has a drum/drum combo valve, UNmodified.
Pedal ratio COULD play a role. The pedal in the car is the same one it had in December 1969. The manual disc setup MAY have been doomed from the start. Heres why: The car originally has 4 wheel drum brakes. Drum brakes require LESS fluid volume and pressure. It stopped okay with the original setup. I switched to power disc/drums. It stopped great at all speeds. I added rear disc brakes because I thought that they would look better through the wheel spokes. The braking barely improved. Later, as I tuned the motor and got it to idle down to 700 in gear, the low vacuum made slow speed braking pretty bad. THAT is why I went to a manual master cylinder.
The POINT ??
The pedal ratio MAY be fine with the A body power brake booster and M/C.
The pedal ratio was fine with 4 wheel drums since they require less force.
Maybe the pedal ratio simply is NOT enough for the 4 wheel manual discs.