'73 up brake distribution block/proportioning valve question

I'm a little late to the party but this is exactly where I need to be. I have all the hardware for a large disc conversion. My car is a 1972 Demon 340, Manual brakes. There seams to be a lot of knowledge on this thread so my question is Exactly what do I need as far as a proportioning valve and/or Master cylinder change? I'm staying manual and definitely would like to stay away from an adjustable valve. My stock Master chambers are identical which it sounds like many of you know. Thanks in advance for any help...