I tried plugging the vacuum advance into manifold vacuum, cheap an easy way of adding a bunch of initial timing, which I confirmed with the light (about 14-16). But it didn't improve the idle speed nor vacuum. So the added timing seemed to do very little.
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Probably true. Have you talked to him about the low manifold vacuum?
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Only in passing, because there's no problem other than the number on the gauge. But I'll find out what he uses for lifted pre-load, if it's anywhere near tight (like more than 1/2 turn past zero) I'll chase that lead a little further.