I am in the process of ordering a 9" rear end from Quick Performance for my 65 Mustang Coupe which currently has the 8". I am wanting to narrow the rear end enough to where I can add backspacing to my rear wheels. I like the look of a "deep dish wheel" on the rear. Does anyone know how much I can narrow the rear end without making any changes to the wheel well area or interfering with the leaf springs? I am changing the leaf springs to the mideye 5 leaf to be able to lower the car 1" or so. I want to run 17x8 or 17x9 wheels with tire size big enough to look good but not rub. Does anyone know with this how much backspacing I would need? Just an FYI (if needed)...I am going to 4 wheel disk brake from Wilwood. Thanks for any help you can give.