The tire stretch on the 10.5s isn't bad at all. I've been nervous about 255 looking bad on 10s, but I think as long as I go with a tire with a wide contact patch like yours it will look good.
There's one sure fire way to find out. Hoyta, are you willing to swap corners for a fit check of the 10.5s on 245s in the front? Try a few driveways at an angle or some thing?
I had 20x8.5 squared. I didn't like the look at all in the rear. Too far in. Would need much more than a 5-10mm spacer for it to be flush with a 8.5 +45 I think, but I'm not running a 255 either. I can still run maybe a 10" spacer. I do have some negative camber- not a ton. Running a 10.5 on the front of this car would be dumb.
why do you say that? i feel like the staggered setup w/ less concave on the front looks silly. to each their own. but do you know if they would at least fit, and not rub? members are looking.