You don't want a stretched transmission, exchange that for a mostly locked differential. Also, you're going to want some a pretty decent amount of positive toe to give you grip under heavy acceleration. The rest of the suspension should be set up to promote lots of oversteer, as when you have the gears, differential, and wheel alignment set right it will push really hard to the outside of the corner. Something else, the car actually performs better and sets better times if you don't add every engine up grade (stop somewhere around 720-730hp), at it's maxed 786hp it honestly has too much power for the car to reasonably handle anywhere but on the drag strip.