Upgrading my Master Cylinder & Prop Valve - Thoughts On This Combo?

It will work w/ drums, just set the prop valve for max rear brakes (screw in, I think). The rears only do ~30% of the braking. Must be less in my Plymouth Voyager since the rear shoes are still good at 205K miles.

I put a booster/MC on my 65 Dart and prop valve, for eventual disk brakes. I later read many here say they are OK w/ a manual MC and front disks, but get the smallest bore you can find (15/16" or 7/8"D). If you do want a booster, there is a new $130 one w/ MC on ebay. Not avail when I did mine, so my cheap approach was stand-off brackets from a 74 Dart and booster/MC from a cloud car (see avatar).