Re: 1969 C10 SWB - Big Block project
Unless you have a strip only vehicle, you can benefit from vacuum advance, better mileage is not something I would give up. You do NOT have to use vacuum advance, though....
What power valve is in that thing, jets? Total timing. An HEI will work OK, till about 6200, but could use some massaging sometimes.
Tell us about your fuel system, line size, pump, all the way to the tank.........
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