Suggestions for new design Aluminum Mopar SB clean slate (kind of) cylinder heads

PRH said

I’m assuming you’ll be setting them up for SBC rockers.
If not, I’d suggest you do.

Make sure the pushrod slots will easily clear the use of 1.6 rocker ratio.

Make the spring installed height at least 1.800”, and 1.900” would be better.

Valve/rocker positioning to fit/accommodate 1.55” springs would be nice, along with making the heads accept that diameter without needing extra machining.

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If the Magnum or LS valves are used with the 5/16" or 8mm stems and spring installed height of 1.8", beehive springs are readily available and valves like the hollow stem LS2 valves are light.
Back to Johnny Mac's original post and conditions, the intent is basically an improved stock replacement good up to 500HP. Porting and other performance parts in the aftermarket would vastly improve that, I expect. Keep the head valve train mass down. There are dual conical springs available now, but not Ebay priced. If using components designed for the General's LS engines, the parts costs come down.