I have 31 x 14 x 15 Hoosier slicks. Four link with a mustang front clip. It launches and runs good. Weighs 2750 with small block and iron heads. No sag or soft suspension. Run 9 to 11 lbs. My problem is when I was running mid 11 at about 124 mph it ran great. Then put in 406 which got me 10.4 @ 129, but had wheelie problems. (almost going over) I put the top bar on four link down a hole and scaled it, and put wheelie bars on, unfortunately they were put on wrong and I had to remove them. Anyway, now if I go over 120 I start wandering bad and one run it felt like me front end dropped, which was actually my rear lifting off. I am in the process of putting in a 572/620 hp which will be putting me into the 9 with speeds between 130 to 140 .I've talked to people with 41 Willys and they tell me it is a problem with them and normally over 130 they will run wings. My car actually blew over in Bakersfield about 6 years ago, before I owned it. I plan on putting the four link back to where it was, get some proper wheelie bars and rescale the car.