do you have the frame conn. under the car????something seems off..i rana 1.67 (bad) and went 7.40 with 90mph..and my car needed some more chassis work...340 with a soild cam and 5600 verta and 4.57 gear and 28x10.5 slick..car would hook pick the wheel up and set them back down and spin some...full body 70 duster...seems the chassis id off some where..whats your frontend travel??? what shocks ??? not a expert but have learned alot with my old 340:violent1::violent1::violent1: