if you had drum discs on the car, it may be a good idea to transfer the proportioning valve too. as the drum setups take longer to engauge, the valves are designed to delay the fronts some so the rears have time to actuate. your master, and other components should be fine to carry over.

-- cross referance part #'s, i wouldn't be surprised if the master, and MAYBE the prop. valve are the same, but you never know...