I have a 68 with 16" Rallys and since I have done a disk conversion in the front I have had problems with the tire rubbing on the outer fender chrome. It also rubs when I turn. It was rubbing before I went to disks, but now it is much worse. I am going to buy two new Rallys for the front and I am looking at 16*7 w/4.75 backspace and +6 offset. I have asked this before and been told to go with a 4" backspace, but have been searching around and see many folks (with 17*7) going with more backspace. Any suggestions???