theres a good looking set of heads i'm thinking of buying. but the intake ports are bit big. they are 320cc and my motor is 408 cubes. i'm spinning my engine 6500RPM. they are aluminum protopline heads that i can get a good deal on. but i also think the intake is just too big. i'm running solid roller cam 274/280 dur. .640 lift. am i short on cubes? or will i be fine? much help appreciated!