Normally the stock vacuum advance provides more than 10 degrees. I’ve found that 12-15 degrees initial , with about 22 degrees centrifugal advance works well. That gives you 34-37 degrees total advance.
Vacuum advance adds 15 degrees or more. Back in the day, we ran without vacuum advance, which sacriced highway gas mileage. We didn’t care when gas was 25-40 cents per gallon.
A well-respected Pontiac builder, Dan Whitmore, told me a Pontiac engine should see no more than 52 degrees total advance.
You’re welcome to disagree, or add more information.
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'64 GTO Tripower Hardtop (Wife's Car)
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