I have run 275/60r15 on 15x7 rally II's out back on my '67. They fit well, look great, and tucked inside the rear wheelwells with no rubbing. The '68-69 rear wheel well has a little more room than the '67, so the 275/60 is a slam dunk.
You might be able to run a M/T drag radial 275/50r15 but I think you probably would want an actual 8" wide wheel and you might need to roll the rear fender lip.
__________________
"Keep your foot hard on that pedal
Son, never mind them brakes
Let it all hang out 'cause we got a run to make!"
|