My guess would be tween 660-700 hp i had a 502 stroked to 540 9:1 compression 320 dart race heads with a weinand 256 with 2 750 cfm at 4 lbs of boost and it made 825 hp 6200 rpm and was more fuel friendly than when it was making 625 hp with a single dominator

625-650. Had 2 very close. Keep it at about 5-6psi boost.

anywhere from 500 to bang depending on the engine builder