If you have no porting, the motor should pick up a solid 100 hp on a race motor with 572 cubes. I am making about 900 hp, or enough to go consistent 8.80s with 3050 lbs car and driver. You should be able to match that power level with a full port job. After that it will get expensive, because the 572 needs new pistons, and at that point you might as well sell what you have and step up to a B1 head. A B1Mc will make over 1,000 hp, ask Al for details.