Manifold Vacuum Advance what am I not getting?

RustyRatRod said

That doesn't answer a thing. I asked if it ran good without the higher advance. This tells me nothing. The point YOU'RE missing is that I am an advocate of MVA. Lemmie tell you something. I've been working on and tuning on cars since 1974, I promise you "I" am not missing the point.

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I don’t know what you mean by “run good”. That’s a hard question to quantify. When I tuned it, I didn’t look at my timing light at all. I timed it based on what sounded good and smooth and what gave me the highest vacuum. Will it run at 24° yes. Does it seem to run better at 42° I believe so. I believe an engine is more efficient when you have higher vacuum. So I think I answered this question correctly or is best I could.
I can also say that I repeated this tune 3 times and all three times it came out to 42° so it was consistent.