440 power gains/ aluminum head advantages?

fishmens67 said

Do you have headers? More info would be good.
You say the tuning is sorted out and I think that's where most of the problem exists.
A stock low compression 440 should tear the hides off and pull until the valves float.

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yes tti shorty headers. tuning went as far as messing with pv according to vacuum and messing with timing until i locked it at 36 where it seems happy. i have an A/F ratio gauge installed and idles at 13.5ish and cruising is 12.5 and wot is 13. gone through plugs to get it cleaned up so they're good now not getting fouled