I ran in the same problems when I shortened my WB to 112".
You can get around the body mounts if you're creative and you outboard the springs a little bit.
I got some 3/8" wall 3x6 rect. tube, cut and knotched it to sit flush on the side of the chassis, and under the chassis a little bit. Then I made my own hangers and welded them to that so the spring sits on the back side of the rectangle, and outside of the body mount. Then I boxed it all up, added gussets, and bolted it up.
I wish I had a better picture, but this one might help a little bit.
You can kind of see it behind the sliders. I guess it sort of looks like []> and the leaf spring bolt runs through the >.
The set up in the picture: 63 chebbies, belltech shackle, custom hangers f/r, and a 2" block. In that pic she's sittin on 35s, just to give an example of the height that can be expected. (Oh, and the cab is on a 3" body lift)
If you can dream it, you can do it. Usually.