If you don't like the prospect of having a rock hard pedal with no travel, try a manual disc brake master cylinder from a 1974 Charger. That's what I used on my '66 Valiant, and wouldn't have any other setup. 8)
Mine is manual brakes. I used a M/C from an 85 Dodge truck (1 1/8" bore) with front disc off of a 73 Dart, an adjustable prop valve and 11" Ford drums on the rear and the pedal feels good, not too hard and stops on a dime.