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Interesting thread, and I can see both points. I myself would aim towards ported vac. for distributor advance, but the manifold vac. point is intriguing. I also have to say that Cobrashochs' point is both interesting and valid. Would it make a difference that was noticeable by "seat of the pants" method- quite possibly not, but I also think a properly set-up and tuned engine runs much deeper than only what you can feel and sense.
I'm looking forward to more opinions and questions. One, say you were running a pretty steep cam- if your power brakes were suffering enough, would a distributor on manifold vac. make it even worse? It seems it would have to. Not really a question, but more of a consideration. I have wondered why someone would eliminate the vac. advance all together, but I guess it just depends on the situation.
Greg
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