I USE AFR 210 CNC PORTED HEADS ON A 406 CHEVY, 11-1 COMP. 260/264 @ 50, 674/688 SOLID ROLLER,SUPER VIC INTAKE,PRO SYSTEMS 840CFM CARB,4500 ATI STALL,4.56 GEAR,TURBO 350 TRANS IN A 3245LB 86 MONTE CARLO SS,28X9X15 SLICKS, SHE GOES 10.38 @ 128 MPH.THESE HEADS WORK,CALL AFR AND THEIR ENGINEER WILL COME UP WITH A COMBO THAT WILL WORK WITH THE REST OF YOUR MOTOR.
JEFF