So here is how I did the body mounts from memory...
I lowered the body onto the frame, starting with 1/2-in wood shims everywhere the body contacted the frame. Then I took measurements from the door sills to the ground and shimmed the front up high enough so that the body sat level while all the weight of the body was on the suspension.
I had already cut all the body mount brackets off the frame with a cutting disc mounted on a hand grinder.
I then bolted all the body mount brackets I had cut off directly up onto the Wagoneer body with the Dodge rubber bushings attached. With the body mounts now hanging freely in the air, I used steel shims to connect the body mounts to the frame, welding them in solid. Then I slightly jacked up the vehicle and removed the wood shims, setting the body down onto the now-welded body mounts.
The two front mounts were custom made using steel sheet. I believe I have pictures of all the mounts in the build sheet somewhere.
Edit: I guess I didn't include pictures of it. I'll have to walk outside and go take some new pictures and add them...