There's a guy near here working on a revised version of Mickey Thompson's hemi heads with a blower intake for Pontiac. That would be amazing to see finished.
My experience has been the Pontiac bearings let go when you decelerate. On the track you can't throw a turbo 400 into neutral after the run so there aren't many choices. I have a ram air IV pan and pump on it. It's a 53,000 mile 400 motor so it's a good starting place, I'm thinking .030 overbore and a 455 stroke. I think the Edelbrock cnc ported heads are pretty standard these days.