What needs to be done to stuff say 285/50 or 295/50 tires under the back of a '71 Challenger...like what backspacing, rim width, etc. I figured for front maybe 235/50s. What about them for wheel size and stuff. I'm certainly no expert on sizing wheels to tires and all that good stuff. I'm gonna try to later get that kit thing to move the brackets inboard 3"s in the back to get some more tire under there but I'd still probably run the same size tire for regular street service.