IMO 275's are a bit much for an 8" wheel, even in the slightly narrower than normal Nitto's. My dad put 275's on his stock 00 GT wheels and they fit....barely. They bulged quite a bit, and I'm sure the wacked out sidewall didnt help handling too much.
I say stick with 245's and save a couple bucks.
Its not always about width too, as far as traction goes. My 255/50/16 BFG's hook much better than my 315 Nitto's, as the thin sidewall on the 315's doesnt absorb launches very well, in my experience.