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Each person's timing curve is adjusted to what they are looking for. It sounds to me as if you already answered your own question. I run 18 degrees initial advance on my Z, with an additional 20 in the distributor for 38 degrees total, all in by 3000 rpm. With that curve, I wouldn't think of using full manifold vacuum for my vacuum advance. But then again, I don't use that curve for fuel economy.....LOL
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