mustang wheels
On the rear anything more than about 5.5" of B.S. and your going to be hitting the rear springs in a factory stock suspension car if your still have stock width A body rear end.
The front with 18's I have seen others on this forum here run as much as 6.5" BS with a 9" wheel. However wont work with 17" I guess the tie rod end hits the wheel.
I'm doing 18X10 rear and 18x9 fronts right now on my Dart. requires quite a bit of work on the rear. Also note that the hub center of a mustang wheel is to small for the mopar 1973 big bolt pattern hubs. I dealing with that right now. I guess you could bore the wheel center or I'm looking into machining down the hub on my Dart.
My guess in most cases not just a simple bolt on project. However it can be done like shown above.