Just chiming in again. My 3.42 gear set up includes 4 speed M22, and what was a tired 8.2:1 CR engine 400HO with 066 cam grind. the car could always break tires loose, and get sideways for as long as I stayed on the throttle. Rebuilt motor will be 9.7:1 with the Summit #2802 (close to a 068 i'd say), most else stock components, my builder who did the machine work thought that should be a pretty good set up for my uses.. for what its worth.