My brother has quick time pros on his 68 cutlass with a 60 series radial tire on the front. It used to run high 13's with the 350 and drove pretty stable at those speeds. The few shakedown runs with the 455 has it in the elevens at 114mph +/-, and now it takes a lot more wheel action to keep it tracking straight on the top end.

He plans on going with either a taller and narrower radial or a set of bias skinnies soon. This car has yet to be maxed out and another 5-10 mph is only going to make it that much more difficult to handle.

Hoosier tires also follow the trucker ruts in the roads really bad. You have to inflate them up on the street unless you like moving the steering wheel constantly when driving on lousy roads.

I wonder if it's possible to make the car more stable by fiddling with the alignment some????