Very simply put - duct work, find some old duct work or sheet metal and rivit, screw, or bolt it in place, then paint it, or you could fab. some bumper relocation brackets, 1/8in steel would be fine, 1/4 if you bumper tow.
I would go with the brackets to raise the rear bumper and if you need the front raised you can grind the bumper mounts loose from the frame, raise them, and reweld them. That is how we did my brothers S-10. It turned out looking real good.