most people like JDL1000 and Terry (78mphg) do a simple blower swap and see and easy 600rwhp with supporting mods.

i say to be completely safe though just port the Eaton and run it at about 16psi and you will see 500+rwhp which is plenty enough to take otu alot of the area cars and yet still get 20mpg when you not in the throttle.

there is a certain 04 Cobra in Houston with 735rwhp running on stock internals and has been that way since Feb. 05' of course he is nitsou assisted. the sky is the limit on those cars, most break a input shaft and Half-shaft before the engine lets go.