a weiand(a branch of holley) stealth intake manifold is what i would recommend. that flows from idle to 6800 rpm. you also would benefit from a less wild cam, your motor is set up to be a top end screamer right now. throw some slicks on there and i bet it would tear up the ¼mile. but driving on the street it will tear up your wallet. i would take it in steps tho, first get the manifold, see how you like that, then id look into a street/strip cam.

 

Have you messed with the timing or played with the carb?