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Well, the stock intake chokes the stock heads and cam....and you have P&P'd heads and a cam..... So I'd say it's safe to say that yes, you DO need an intake.
on my car with stock intake, ported heads and 1.7 RR on a stock cam, I made max power at 4900 rpms. Now that I have a better intake it does pull longer, but I haven't had it on the dyno to find out how much yet.