I've looked at it witha 305/30/18, and it's very, very tight. You can't run any suspension that requires a spacer. It will require 3.5 degrees camber, etc...
There are a couple of people who say they have done it, but when I tried it with my 11" wheel I came to the conclusion it was a bridge too far.
The other issue will be the tire will rub on the fender liners if it's a 35 profile as you turn it. No way around that. You can massage the liners a bit and that will most likely solve it. I did put a 305/30/19 on the front with a 19x10.5 et22 wheel. It fit, but would rub under turning until I massaged the liners a bit with a heat gun.
The general issue on this car isn't getting the width as much as having a big enough opening to be able to turn it. There are coolers on the front of the wheel wells that you don't want to rub
