I liked the idea of the Mustang II coil overs but looking at your work I think it would need some radical upper spring tower/shock mount surgery. If it came down to literally lopping the whole thing off, I'd try to figure out a way to make the upper control arm adjustable so the camber could be dialled in. There are prefabricated upper spring/shock mounts that can be welded in, but getting the camber right...

By the way - nice work with your truck