I am in the process of scheduling the installation of a Fabtech 3.5 inch spindle kit and 2 two inch rear block kit on my 2001 Ford S/Crew 4x2 and was hoping you could answer a question for me. After the lift is installed I had planned on using Pro Comp Xtreme Alloy wheels, Model 6089, 16x8 with a 4.5 inch backspace. Will this backspace work and how big of a 16 inch tire will I be able to fit without doing extreme alterations to the fender wells. This truck is for my 16 year old son and I want him to have a quality ride. Any assistance would be greatly appreciated.