Based on the rules its pretty open I would say motor first 70T or go BL or you'll be down on power. Next would probably be an aftermarket diff as the extra power might be a little too much for the stock one and an aftermarket one will give you more tuning options. After that its just what you think you need to improve handling. generally most run a disk damper setup and if you want to go all out a double-A arm front end...