If you read the above linked article, I think it explains this better than I could defend.

I understand your point of view, I used to be there. But now I am (so far) convinced that Manifold vacuum is the right way to go when set up properly in combination with the other factors.

I conclude this from reading many articles here (mostly from C9x), and the linked article. Read these:

http://www.clubhotrod.com/forums/sho...vance+canister

http://www.clubhotrod.com/forums/sho...vance+canister

http://www.clubhotrod.com/forums/sho...=ported+vacuum