if you dont want the tire sticking out of the wheelwell, and for it to look clean i'd say mini tub it. i have a 275/60 mickey thompson tire mounted on an 8 inch rim with 5.5 inches of backspacing and its really pushing it.
i dunno if anyones ever fit that size tire in the stock fenderwell but i dont think it could be done, i could be wrong but thats a whole lotta tire