Denny, one thing you might want to consider is the diameter of the brake drums. When I was running the 59 model 3800 with 18" tube type tires and split rims, drop-center wheels would not fit over the rear brake drums. I would have had to go to a 19.5" tubeless wheel for brake clearance, so I just stayed with the 18's. On your 3/4 ton, you might need to swap to a 16" wheel, or possibly a 16.5" for brake drum clearance when you consider the drop center wheel necessary to mount a tubeless tire. Finding stock-appearing 15" 8-lug wheels might be a challenge, too. 16.5's are a direct swap height-wise for 15" tube-type tires.
Jerry

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