360 Tune Up

Rock Able said
I'm running electric fan and that is all I can use.
Thanks for the link. I will read it later and experiment with the curves.This is what I needed as all my previous experience was with SBC's. The vacuum can on the unit I installed today is adjustable. The previous one was not.

I usually use manifold vacuum on SBC's. Why would ported be recommended on SB Mopars? My engine is idling fine.
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Honestly I wish I knew a solid answer to that, my best guess has to do with SBM's having more efficient cylinder filling and dynamic compression at idle and low RPMs. I haven't played with many Chevies but I have heard SBCs do prefer manifold vacuum advance. I just know every time I've tried to use manifold vacuum on a Mopar engine it ran worse.