440 power gains/ aluminum head advantages?

RustyRatRod said

Yeah, that's too much total anyway. Generally, big blocks like a little less total than small blocks. Most times in the 30-34 degree range. That's a fairly lumpy camshaft, so I would recommend trying the vacuum advance on manifold vacuum with about 40 degrees initial with the vacuum advance hooked up at idle. Then limit the total to 34 degrees all in by 3000 and see how it does.

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okay so i've got some things confused i think. so right now ive got no vacuum advance and locked at 36 so it should be 36 all the time. you would recommend get it so its idling at 40 degrees with vacuum advanced hooked up. but i always thought as your engine revs up it pulls more vacuum so wouldn't that only advance your timing more with the vacuum advance? how can i achieve less timing at higher rpm from idle with vacuum advance?