There have been crazy numbers thrown at a stock ls1. I have seen 650rwhp(m6). look in the gm tech mags. There are heads and cam ls1 with 150 shots and blown ones with stock bottom ends. They are a lot stronger and can take more abuse. I would buy some good forged pistons and 36lb injectors and hope your trans holds. Get on the dyno so you know where you have to stop and be safe. A controller would help with the shock. It would be a smart thing with a 200 shot. Taking away the shock will save the driveline and rear. If you get a purge valve you could also send more of a shock because there will be just juice flowing into the motor. The air will be gone, it will be more of a sudden hit. Not good.