You will have no problem getting 625-650-HP with your setup. If you ever take it to the track make sure you put some race gas in it. I don't care what they say about big cams bleeding off compression . That may work on the street but when you are cruising along at 6,500 you are packing a lot of fuel and air into those cylinders.
My Dart 408 with out of the box CNC AFR 205's made 615 on the engine Dyno and 475 RWHP on a Mustang Dyno
Your gonna embarras alot of guys with the "correct engine"