offset
my 66 has the stock 10 bolt, 8.2". I mini tubbed mine and was able to fit a 315/35/17 under there with an 8" offset wheel. the F body 12 bolt is wider, so you may need more than 8" offset to be able to run that diff. Measuring would be the best bet. Good luck, hope you can make it work. I know cutting down the diff is expensive and can be a pain, but that would work and look great under your 62