Probably not going to work. Why a 12.5" wide wheel? Going to suck all the way around. Get an 8" wheel and actually enjoy it.

And no your alignment will be way off with a montero upper arm. You wouldn't even gain an 1" either. I have a montero with 33's and it barely works because of the huge fender cutouts that Montero's have. Your max is quite a bit smaller wheel arch. You will smack the front bumper with 33's.