My 347 puts out 425 hp and the same amount of torque (flywheel). Behind it I have a hardened T-5 from Astro Performance, balanced aluminum driveshaft, a nine inch rear with 3:70 gears and tracloc. The springs are four leaf and I have welded on subframe connectors. I put no thought into how to get traction until I started driving the car. Right now I have 235r60 15s BF Goodrich T/A tires. The car accelerates like a beast but hitting the accelerator even moderately hard in first or second gear gives me a tremendous amount of tire spin and a squirrely rear end. The car is dangerous to drive hard. Playing with tire pressure does no good. I'm going to look at tires first. Maybe 255/50-17 summer tires on the rear. Not sure about the front. Maybe caltec traction bars? Can anyone with experience with this sort of problem please give me some advise?