I was concerned with ride height, so I measured from the top of the frame to the bottom of the springs. The ’47 is 10", the ’88 is 13". If I place the ’47 body on the ’88 frame, the relative position of the wheel to the wheel well will be 3" greater than the stock ’47.
The ’47 has 2" wood mounting blocks. There are rails across the bed underside. The bed can be mounted closer to the frame by removing the wood blocks and modifying the rails. It looks like I can set the ’47 body on the ’88 frame and maintain the stock ’47 stance.
I have LT245/75R16 tires on the rear currently. Those are about 30" tall. If I maintain this stance, the space between the top of the rear tire and the fender will be 4". The fender opening is 31" so I won’t run a taller tire without modification.