The notion that you “need” more compression with aluminum heads has been tested at least once with a SBC, where you can buy heads that are the same in iron or aluminum........ and the results are that the power was the same.

Imo...... it is totally a non-issue, and falls into the “over thinking the combo” category.

Run the aluminum heads and enjoy.

The factory engineered 6.0 in my 2004 Chevy truck seems to run just fine with aluminum heads and “only” 9.4:1CR.

Oh...... and as for the NHRA stock/ss thing...... the aluminum heads actually come with a HP penalty(car has to be heavier or run a higher class)...... and a lot of the time guys run them anyway.

https://www.hotrod.com/articles/ccrp-0602-iron-versus-aluminum-cylinder-heads-test/