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I'm no expert here, but there seems to be a lot of discussion on the internet (google: ported vacuum advance) about whether to use "ported" or "manifold" vacuum for ignition timing advance. From what I read briefly, you need to determine which is best for the tune of your specific engine. I suggest you do a bit more research to determine from where to access vacuum for your ignition. Also, I don't recall you saying "why" you are swapping out your mechanical-only distributor for one with vacuum advance.
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