Wanting a 18x9f 18x10r wheel setup am I crazy?

just wanted to say thanks to you guys for all the info in this thread i have been havin a hard time figuring out what would fit on my 73 dart swinger, correct me if im wrong, but from what i read, i was planing on installing a ford 8.8 in the rear, if i want 18x9's or 18x10's im going to need to move the springs in and tub the rear? or will just the shorter axel shafts make enough of a difference?