kelsey hayes part and proportioning valve

RedFish said
The OEM DOT3 brake fluid draws moisture which causes rust. Thus used proportion valves are much like used master cylinders. Odds against you.

Depending on who took them off and how they were stored. I usually cut the lines crimping them shut . In line tube sells the valve also.

1969-1974 Mopar A-Body Distribution Block Disc Or Drum Brakes