My '69 seems to get a lot of wheel hop in the back. I am pushing 550HP. and the traction bars just don't cut it. I have 315x35x17 tires on the back. anyone been experimenting with different leaf springs? or coilovers for more down force on the differential? I know a 3 link system is the best, but I would lose the back seat. I have an 8 point rollbar now with subframe con.