i have a 305 tbi and i am running 13.20's at the track and my car shakes at around 85 or 90. i have had the tires balanced recently and i have the aluminum driveshaft. i have tires 245/50/16 up front (radial) and mt street 26x11.50 15 out back (bias). please help and thanks in advance.

I just read your post and I think it is the rear tires. How much air in them? My mustang had these tires with 15 psi and it floated all over the place, not a safe feeling.

Pete