Best Machine built a 572 last year for a customer of mine. It had EZ325 heads and it made 860 hp on the dyno. It was an EFI, dry sump, Jesel belt drive, T&D rocker arm type engine so not your average bracket racer stuff. Nice motor, probably would've made over 900 hp with 572-13 heads but the customer was constrained to stock port locations.
Engine also had an Indy aluminum block and the intake was ported by Wilson. Big buck engine, probably had close to $40,000 in it by the time they were done.