i have a '65 coronet with a 440 under the hood. the car weighs 3900lbs with me in it and 55% of that is on the front wheels. when i put it together i used .92 bars and had some skinny tires up front. car handled terribly. i added a 1.125" firm feel sway bar and some 15" 70 series radials and the car drove nice and the front end was like it was on rails. i wouldn't go any larger than a .96"; unless you want a log wagon ride.