Hey moparts. I have an engine I purchased from a member here on moparts. And wanted to know is there a better cylinder head I can purchase other than the B1/ BA M/C head that currently on it. The engine is 455ci
4.25 crank billet
4.125 bore
12-13:1 comp
620 roller
R3 siamese 59 degree block.
Dyno sheets states it made 630 H.P. 650 ft. lbs of torque.
I have not run it in my car but know I want more power in the near future. Will an Indy or W-9 head pick up horsepower level. I would like to see 750-800 H.P.