does anyone ever notice that a lot of 360 winged sprintcars are 39'' motorplate cars. Also do you think they build 360's this way to hook them up? Just a little food for thought. before one does all the work. Also becareful when playing with arm length front or rear the spring rate changes are drastic if you look on a spring rate chart shock rate still stay's the same unless you change the pick-up point from the axle center line whether its a 38 or 42 inch car. 1200# is still 1200# however roll center can effect shock valving choice.