How much horsepower should I expect?

I forgot to say my power estimate. My guess is 420 to 440 with about 500 tq. Like I said your rear tires will be begging for mercy. Also the A-518 has a .69 O/D so with 3.55 gears your final drive will be 2.45. Your cruise RPM onthe highway will be nice and low which is another good reason to keep the small parts you have.