5100's can only adjust the height of the vehicle on the front. The rear 5100's are a little longer than stock shocks so they allow for up to 1 inch of rear lift, but can't actually lift the rear of the truck. I would set the front shocks at the highest setting, which should give you 38.1 inches up front, leaving 1.5 inches of rake if you leave the rear block in. I like the rake because I tow and haul stuff fairly often, and I don't like the look of a sagging truck. That tire size should fit with no issues also.
Another thing to consider when trying to find the "leveled" look is the amount of space between the top of your tires and the wheel wells. At least on my truck, when I had a 2.5 inch RC kit in the front, it looked like the front was higher because there was more space between the top of front tire and the wheel well than on the back. It might have been an optical illusion because the wheel well measurements showed that the front was actually still a little lower than the back, but it looked higher. Just my opinion.