http://www.autoblog.com/2007/10/29/s...let-coupe-e85/
I thought that the GM eco tec that was in the E85 coupe would be awsome in a Cobra. It was making 500 Hp with a big turbo and burning E85. Other than that, you can't go wrong with an old Ford 2.3L (I believe this was the basis for the SVO) They offer a lot of race parts for this engine, and I have seen Turbo versions in Mustangs that run the quarter in the 8's.