I need to see if they make a lowering shackle for your rig. That would be the way to go. Cheap, easy to install, and won't affect ride or towing capability. They have two different holes that you can use when installing them. This would allow you to either lower 1" or 2" depend on the look you are going for.
I've never put one on a F-350. Give me until Monday PM to get ya an answer on this one.