what master cylinder for disk/disk set up?

superdart said

So with my 4 wheel disc setup (11.75 Front/11" Rear) I need to be looking at Dr. Diffs 2 bolt unit and a drum/drum prop valve?

I've gotten stuff from Cass before, so that's no biggie. But where does one buy a drum/drum prop valve?

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From a junked 4 wheel drum car!

I may be wrong on this, but I think that in the case of a drum/drum car, the unit is called a combination valve. There is no "proportioning" in a drum brake car. Only disc/drum cars had a built in valve that reduced pressure to the rear.