Re: 1958 Apache 3800 Hydrovac
Forgive me if I'm wrong here, but the hydrovac boosters I remember had a master cyl that was foot pedal operated and that sent a signal to the hydrovac booster mounted somewhere else and it also has master cylinder on it that operates the brakes. Really, a hydrovac from a newer truck should be able to be serviced on your old truck. Just do a bore size comparo and go from there. Maybe also run a vacuum reservoir tank with one way valves so you don't run out of vacuum. Really though, if using the brakes, the throttle should be closed causing a higher vacuum. It depends on rpm then as to what vacuum you actually see.
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