to the guys that know everything about dart swingers...

I just bought my first one and plan to learn as much here as possible! Its got a 318, auto. It actually has a manual valve trans, which is fun as well. According to the fender tag, it was originally a gold color and came with the /6. I dont know what year the 318 is from and I imagine it has the 904 transmission in it. Not sure what rear end either. It runs strong and used to be owned by a guy that owned a body shop, so the paint and everything else is done right. It originally came with the stripe on the rear, so I plan to add that. I do plan to get different rim and tires for it, but I will also keep these. I have been doing some research and it appears that 15x7 wheels are the biggest that fit without rubbing. Can you tell me what size tire and what backspacing is needed that is the biggest on the rear without rubbing? I appreciate it. Here are some photos...