440 power gains/ aluminum head advantages?

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.