273 questions...a few of them

I'm sure you have a problem with cam timing. i ran a 484 in a 318 a 535 in a 340 and a 606 in a 440, all way above the stock lift and had no clearence problems. you are either opening to soon or staying open late. pull the heads, yea your gonna need new gaskets and check your pistons and get a proper TDC. install your head without a gasket and check the specs of the cam against the card.