Best thing, find the STIFFEST springs, and something in the 50-70 wt shock oil range. Also, look for shock pistons with tiny holes, smallest you can find. Drop to the lowest ride height possible, and the thickest sway bar. Since 99% of what you'll find to fit will be meant for off road, this should be a good starting point. Suggestions on specifics would only work if somebody already raced that truck on your track under those conditions. Other specific suggestions would simply be shots in the dark.