So I would say run 17x8's all the way around. In the front you'd want 17x8's with 5.25" to 5.6" backspace, and in the back you'd want 17x8's with 4" to 4.5" backspace. That would allow you to run 245/45/17's all the way around, or 245/45/17's in the front and 255/45/17's out back if you wanted. Only reason I don't say 255/45/17's all the way around is that's a 26.1" tall tire, and on a Barracuda that may cause issues in the front with the lower front corner of the fender.
