I would ditch the works, get an OEM Bendix/Bendix clone master cylinder, a manual brake pedal and mounting bracket, a nice set of drums, shoes, an OEM "control valve" if that isn't present up front, and put it all back as Ma Par rolled it off the line. I admit that since getting our '83 D150 with manual disk brakes up front, that maybe one CAN attain a stable, safe manual disk brake system, despite what the brake shop "experts*" oink about "throw." If I were to put disk brakes on a mid 60s C body, I would study how this truck is constructed and use that for my model . Be that as it may, I like the original all drum setup with good quality components best. Manual brakes require naught but some muscle to drive them, working just as well with the motor off as on.