shelby intake manifold

the shelby intake is just an edelbrock F4B intake from the 60's with the shelby logo on it. shelby had edelbrock cast the intakes for him. it is a decent intake, and should give an increase in mid range power over your performer, but not as much as the rpm or the stealth intakes will. as was said, technology marches on.
 
i was also looking into getting an edelbrock rpm air gap, i hear they are pretty good, they are kind of expensive, could anyone tell me what the best bang for my buck intake manifold would be? heres my engine set up:
302
hi-po 289 heads, ported and polished around 11:1 compression
comp cams magnum muscle 282s cam,
solid flat tappit lifters,
528 lift int/exh
236 durration @.050 inch timing
110 lobe seperation
edelbrock performer intake manifold
holley 650 double pumper 4bbl carb
heddman torq-step long tube hedders
shelby style dual side exit exhaust 2 1/4 in Inside diameter, with glass pack mufflers
MSD 6A ignition with blaster II coil

alright based on that what should i get for an intake manifold? thanks a bunch