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I also know from experience you can adapt the 73-87 brake booster and master cylinder onto 1963-72 trucks with out much effort too /forums/images/graemlins/thumb.gif That would make finding the parts so much easier.
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you can but it take mods, more than most want to take on, 73-=up is a total different design and setup, 73 up are single rod and one piece unit as far as the linkage goes, and 73-up have no rod cage assembly and also dotn stick out so far into the engine compartment in most cases, depending on if is bendix or delco moraine unit.