I been reading & reading and cant seem get the Idea. I have a genv 454 with 27cc dome pistons, roller comp camp 273 grind with intake at 224 & exhaust 236 @ .50 with a 113 slope, vale lift .537 & 547. I want aluminum heads to clear the pistons. But all the reading about runners , ports etc is kicking my ass. Basically I want a daily driver with torque. Im looking to spend around 900per head if that helps. Weww I had to get all this is out man , I need help.