Need help identifying brakes please

Thanks for everyone's input. Now that it seems I have 1970-72 B/E body front discs and HD 11x2 1/2 rear drums, I need a recommendation as to master cylinder as the Dart still has the master cylinder for a drum car and I've read that this is not a good idea. Right?
I'll start a new thread for this called "need Master Cylinder Recommendation".
Bill