Would i use a 2" or a 2.5" to level the front of my 07 screw fx4?

 

I am considering a leveling kit for my 09 F150 4wd crew cab ,and measured from the top of the front tires to the fender lip . Measuring 7 1/4 " I then did the same at the rear of the truck, getting a measurement of 9 3/8" . I am gonna go with a 2" increase { front only } on mine . I have no idea if there is a difference in our 2 trucks front suspensions, but I do not want to get carried away with a lift . Planning on staying with the 17" size wheels, but a size or two increase in tire from the stock 255-70-17 is about all I need or want . We'll see ??