I have owned my car for 30+ years and had manual brakes since I bought it. They work great and never gave the pedal pressure a second thought. I switched to Wilwood brakes years ago and used a 7/8" MC (IIRC from a '68 Corvette). Works great but needs a proportioning valve because the rears would lock up first under hard braking since the pad surface area on the rears is large. Just make sure you use the top hole in the pedal and a smallish (7/8" or 15/16") MC or you will have to press real hard to stop. Recently, I bought a 7/8" MC from Wilwood and it required me to modify the pushrod length. We will see how it is once the car is back on the road.