You can buy all the pieces to do it seperately now except for the shock hoops/mounts.
His springs probably max out before the shocks do. I know my springs max out before the shocks do in both directions. I have f250 shock towers which would be an excellent choice if duff isn't producing any of their own yet. You can buy them at the ford dealership. I got mine online somewhere.If I were to raise it up into a hoop like I was talking about, would I gain any articulation, or is it pretty much maxed out the way you have it?