performer or rpm?????? help deciding

im currently building my h/c/i setup. im going with gt40p's with oversized valves and ported exhasut, custom cam(fti), and either a performer or rpm intake. im debating which should i get? performer or rpm?? im leaning towards the performer since the rpm is more of a top end manifold. will i actually gain hp/tq if i went with the rpm??? ohh yeah im also going with 3.90 gears
 
unless your planing on reving it out pretty far or puting on a turbo/supercharger, i would get the performer. you lose tq with the RPM down low but you make up for it with better hp in the top end. it still comes down to which u want, either bottom end torque or high rpm hp.