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The lines to the military disty are for the governor. Neither the civy nor military 302s had vacuum advance; it wasn't used in the big trucks. It would be of limited value in a large truck since you seldom are at light load. You can stay 24V regardless of whether our not you keep the...

The best thing you can do is convert to a civiliian style distributor. Get a disty from an early chevy six. You can also convert to a pertronix electronic ignition. I used the 1167 pertronix in my m35 but the gmc is the same internally. You will need to keep the original ballast resistor and...