It sure can be worth it.
You are correct, see where you are first, then make a change and recheck.
A lot of, but not all Pontiacs distributors are in the neighborhood for amount of advance, but the “Hood Springs” they shipped with need to be addressed.
Along with some limitation of the vac advance unit for sure.
Fairly reasonable gains can in fact be had at much of anything under 3500 rpm, especially at cruise.
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