456 gears

Here we go again, big power engine with a near stock chassis. Either that engine doesn't make any where near 600 horsepower or your chassis is total crap. So is it a leaf spring car? How wide is the tire, you are leaving a lot of information out for anyone to give you good advice.

However I'm going to guess that with that size tire you don't have much for a chassis. If you were really serious about racing you should have built the chassis first. That kind of power should be in a four link or ladder bar car with at least a 14/32 tire and a 5.13 gear.