[patrickt]

Doing a little guess-work I can get those specs on the software dyno to put out maybe 350 at the flywheel, which will get you under 300 at the rear wheels. Do a dyno tune, see what your actual numbers and torque curve look like, and you can go from there. I believe the "sweet spot" in a Cobra is the 450 to 475 horsepower range (flywheel). That's easily done with your engine, but you're going to need new heads and a cam; it will still be very "street friendly" though. That's not terribly expensive either.