Well, it looks like you're going S/C now (I recommend turbo ), but I believe the only N/A L36 to put down 250whp was a GP GT that was sponsered by ZZP. Plus the thing was a stroker. I myself have a lot of mods (as far as a N/A L36 is concerned) and I am still only putting down around 210whp. I do have plans in the works though for next year. 220whp is absolutely possible, but 250whp will take too much money on a N/A build. Good luck with the car, and have fun.