I have 15x7's TT2's with standard backspacing (3.75) on my '67. I used the one inch drop springs all the way around the car and I had to roll the fenders because it rubbed. On the rears, I have 235/60's and on front, I have 215/60s. All BF Goodrich T/A's.
I have a set of 15x7 AR200s on my 67 coupe. I have 255 60 on the rear and 235 60 on the front (bf goodrich radial t/a's), so far no rub. If you go to my homepage you will see a pic of them on the car if you would like to see what it looks like. Kalin