Master Cylinder Autopsy

A dual-piston MC would be safer, and was a fed mandate ~1967. Search for my post using a 1999 Breeze MC on 2-4 bolt adapter plate ($30 ebay) in my 1964 Valiant w/ manual brakes. I likely gave the PN's for fittings to connect new tubing to your existing distribution block and rear tube (bubble-packs at Autozone). The brake pedal wound up in the same place. Loosen the brake pedal switch and re-adjust when done. It shouldn't restrict pedal motion.