i need your opinion on the intake manifolds i should consider for my 72 challenger. i have a 318 bored .040 over with pistons set to zero deck clearance. the heads have been milled .040 and are 2.02 valve 340 heads. i am running a purple shaft cam .484 lift .284 duration. currently i have an edelbrock performer on the engine with a 600cfm holley. what intake should i switch to and should i consider a bigger carb?