Wanna be Pro Street.

[Tim's68]

Ive been taking in the information from this site for several years and now time has come for me to ask for help. I have a 68 short bed that Im wanting to do a back half on. WHERE DO I START, I want the truck to set low, the tires I have are MT 33X22X20 with 20X15 Billett Specialties wheels. I also have the Autoweld Pro Street 4 link. Do I set the truck level if so how high off the ground or does it matter, as long as its level???? I plan on building the rear clip out of 2X4 tube. How do I know how wide the rear clip should be from out side of rail to out side of rail? If any of yall have pictures or some good advice I would appreciate it. I will try to get some pictures of the wheels / 4link posted and the truck.