+1

S2000s have way to short of a wheel base and too tuned of a suspension to just drop some high HP/TQ motor into it. You'll need to change the suspension arms to make the car more stable before you attempt to make it really unsafe.

I say this from people who take S2000s and try and make them drift cars w/o changing anything on them. They're tuned for grip so much so that they have really bad snap oversteer - which is what is going to happen when you give it gas from a LS1 or 2JZ.