Well if you can afford to spend $280-$300 get a custom cam, the AFM N-61 really woke mine up, but it does require deeper reliefs in the pistons, (not quite sure exactly what you have) the N4 has around .512 lift and is very popular as well.
What injector are are running and what Mass Air conversion are you going to do? I would suggest 24# or 30# inj, and DONT GET THE COBRA MASS AIR CONVERSION, you don't want a Cobra computer, it re acts slower and pulls a lot of timing up high, and adds fuel.
The cam will determine the power band along with the heads, I would say with a decent cam with 228+ duration you will go 6400rpm with no problems, as long as your valve springs can take that kind of lift/ and rpm.
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D/R 10108 NMRA Drag Radial, 25.5 chassis, F1R
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