I've acquired a set of 7J 17" Thrashstar Showwheels last week and trial fitted one on the front of my Dart.
They have 4.25" offset, which (unfortunatly) is only 3mm more than the current wheels on the car, and on which the tire rubs the fender during steering and just a slight suspension compression.
The tire in the pic is a 225/50/17.
It is a little closer to the fender's edge than the 215/60/15 tire I currently run with, so it will rub for sure.
I will need to find/match up a tire that gives a slightly more room, without looking too small. Thinking of going with 215/45/17, or 205/50/17.
Might even going as far to roll the fender lip a bit, or work the entire fender's wheel opening outwards to get more tire room.