Yes, the 73+ disks stick out further. A 17x7 with 4" of backspace and a 215/50/17 tire should fit because you've got a Barracuda, but it will be close enough that you might have to make a few adjustments to things like the lower fender corner to bumper braces, etc. You wouldn't be able to go any wider than that. 4.25" of backspace would be a heck of a lot better.
You can put the calipers to the front or back, but you also have to swap the spindles side to side so the bleeder stays in the right spot if you do that.
