Performer RPM Magnum heads?

Go the Magnum route and use trick flow heads and the Harland sharp rockers. TTI 1-3/4-1-7/8 headers. Set your pistons up for a pump gas ratio as the TF heads have a small chamber and a zero deck height could be hard to on feed pump gas. I got away with it (zero deck height slugs and TF heads) with 93 octane. Small hyd roller cam @ 224@050.

Your cam selection should start with at least another 30*’s @050.
I’d be looking at a solid cam for a LA and a solid roller for the Magnum mill.