I would strongly recommend it. I have fitted after market vacuum units to several Dodges (my current WC53 stops better than a brand new Landcruiser) and a number of civilian older commercial vehicles.
Don't know about the GM Hydrovac unit but the generic units are cheap and can be fitted in a couple of hours.
The easiest, cheapest and most practical way to get modern braking on an old vehicle.
Lang
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