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Well, before I tow it over to The Pro, I'm going to swap on an HEI unit with a new cap, rotor, and wires. That'll eliminate any possibility of the vacuum advance being flaky, the points being goofy, the dwell being off, a cracked cap, and wires being fudged.
I'd try the old dollar bill trick (man, that's a classic), but the exhaust is so eat up with rust that I don't think it'd be a reliable test. Once I get the ignition stuff replaced, I'll run another vacuum test and see if I made any difference. If not, then I'll let someone else have a look.
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