1968 Dart Brake and Booster issues?

PinkGT said

I thought swapping out the 4 wheel drum MCylinder for a Disc/Drum MC would mean I could go back to my old DValve. I suppose I would likely need that NOS style P.Valve to solve the problem though?

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The car does not care what M/C is on it, and the P-valve is in no wise matched to it. The only only differences between these two styles is that the drum-drum unit has 10psi hold-back valve installed in BOTH ports whereas the Disc-drum has it only in the port to the rear brakes.
And the DB unit has a larger reservoir for the front brakes. That is all.
You can make any Mopar M/C work on your car, whether DB fronts or not.

Post 6 is now finished,lol.