It depends on the type of chassis you want to build. If you go with the a-tipical narrowing front that gets really narrow up front you're in for trouble. Funnycars are 125 inch and except for the outragious power they will steer and handle very well. If you want to run a short wheelbase it is going to be stiff and wider, and if you want to be able to steer it run funnycar front wheels and tires.My fed is 127 just finished in 2011 and with the stouter tires on the front makes it drives and steers like a dream. Check it out at the Nostagia Nationals at Denton TX april 6. The XL-Kites car, see yea. Mildsteel.