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will probably get 255/35/20 front and 295/35/20 rear with 8.5s and 10s
You don"t want both front and rear to be 35 profile.
You want 30 in the rear and 35 front. The width will even it out to be the same. Unless you want more rubber in the back, which I guess makes sense for certain looks.
this website is great, check it out and it will tell you what the diameter will end up being compared to other sizes people are using.
The reason i am looking too, is I have a 2011 5.0 and we're making it for SEMA and I want to make sure I get the best tire size possible.