"1970 Pro Touring Dart Build"

a +24 ON A 9" RIM WOULD BE 5.94 B/S
I would not open up the center of the wheel. I would turn down the rotor. Thats what I did on mine.
I've got a mustang II front end. I'd have to turn down the hub.
Looks like this.



Remember anything is possible depending how much time and money you want to spend...I like a wide tire (especially on the rear) but considering a stock 340 Duster (I know you have a Dart) came with a 14"x 5.5" I think a 17" x 7" with a considerabily lowered stance, no clearance issues and no air bags should make one bad *** car. Denny and I pushed the envelope designing my suspension with 100% drivability in mind. You can only go so low with factory Mustang backspacing without major surgery.

Ross, thats why I think I'm not going to get the ride height i want without massaging the inner fenders. Not sure If I'm willing to spend the time on that since I have to let my body guy get to work. Might be able to use a spacer to set it out far enough to clear the downward slope of the inner fender, but I doubt it.

I'll call it my $125 experiment. If it works, I save myself a ton of dough in wheels. If not, back to square 1.