Interesting estimates so far.
IMO, I think the "little" 4150 carb will limit the airflow of the 572 CID at higher rpm (7000 ish), and therefore make less peak horsepower. Even if it makes more peak torque around 5500-5700 rpm.

I really want to know what rpm the peak torque and peak horsepower will occur.
Nothing fancy on this engine. The only "exotic" part is the Predator offset distributor. I got a good deal on one that had only 1 season of use. So the typical MSD billet distributor will stay with my old 570 hp iron head engine.