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I don't see 900hp being too far out of line for a 572. Do you have the cam yet? I would think you would need something in the 280+ duration and more lift to make that power with those heads. Will you run them OOTB?
I kinda wanna keep spring pressure on the less crazy side. It’s a street car mostly. The trick flow 270’s are CNC ported to max wedge from factory I’ll run titanium intake valves, retainers Jessel rockers. Intake will be max wedge tunnel ram with twin 4500’s