If you're worried about the vacuum pump or it's electrical components failing you have two other options. Setup the braking system for manual brakes or hydroboost. Hydroboost is not a great option if the car is used in open road race or auto-x conditions because it lacks the ability to finely modulate pressure. However from your signature it sounds like these are street/drag cars in which hydroboost would be perfectly acceptable.
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-Jason
1969 Pontiac Firebird
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