The Willys weighs 2780. It has Hoosier 31x14x15 slicks. I run between 9 and 11 lbs. It is a four link. The suspension is quite rigid. No sag. What has happened is I had big wheelie problems to point of almost going over, I had the 4 link put to lower hole and scaled it. I had wheelie bars put on but they were improperly installed and pulled the back wheels off ground when it wheelied. Before I adjusted the four link I could run it up to 129 mph with slight wandering, but manageable, but extreme front end lift, thus the four link adjustment, which has given me top end lift. I intend on putting the four link back where it was and put properly installed wheelie bars on, but I am putting a 572/620 hp in opposed to the 406 small block I had in it, so I will have a little more weight on front, but will have a lot more torque and speed. This car actually blew over in Bakersfield about 7 years ago. It was told it was going in the 150 mph range when it went over. With with the new engine I should see mid to high 9 with 140 to 150 mph