Widest rear setup for bagged mustang

[TheTxPilot]

I have a 2019 GT Vert. Does anyoneknow the widest rear setup I can (should) do with a bagged mustang. I don't want to do any body mods and ide like to air out the car at shows. Can anyone recommend a wheel deminsion with recommend positive offset and backspacing? Ide really like to squeeze 305s in the rear.

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[Burkey]

In my experience, the rears are less of a problem than the fronts.
I’m running Project 6GR wheels (10” +35 and 11” +50) with Continental 5p 275/35/20 and 295/35/20.
My daily ride height is 35mm below stock PP
Front camber around -1.8 rear around -2.2
Rears clear fairly easily, fronts not so much.
The problem area highlighted below.
YMMV.