I was running Hoosier QTP 28x11.5-15's and the only thing I had to do was move the axle back about 1/4". When the trap speeds went over 125mph, they were growing enough to rub on the front/metal edge of the fender opening. Moving the axle back solved that. And the fender wells had already been hammered for my street 315's.
When I tried to put the ET Drags on - which are supposed to be 28.1" diameter - they wouldn't even clear the edge of the bumper cover. I ended up cutting about 1/2" off the rear bumper cover, and hammering back the sheet metal "point" that is right under the bumper. I actually ended up with a groove in the tire after a dyno pull that took it up over 130mph.
Bumper cover:
Front/metal edge of wheel opening:
http://www.injuneer.com/images/photo.../DCP04018a.jpg