I know this has been asked before a million times, but I can't find any previous forums with what i'm looking for. What's the biggest tire/wheel combo I can go with on a 1966 Coupe without rolling the fenders. Also how much backspacing do I need. I am not familiar with how backspacing works. I have 5 lugs and drums all around. If you need any more info just ask. Thanks for the help