Wow. Hey Ed, I recall we have spoken several times via pm about you looking for a big brother for your 708. This one has lots of potential there. The long driver's side fuel tank is there, as well as the behind-the-cab toolbox. The window, windshield glass, and front fender would be easy to replace. The bed, albeit rusty, looks to be fairly straight.
Repower it if you absolutely must, but consider keeping the gasser as is. . . . or at least keep the parts if you ever want to revert back to original.
Please keep us posted and get more pictures. Not many of those left around. You might ask TacticalTruck about it, he has an M47 dump (similar, but rides on 11.00 singles, and has a narrower bed IIRC)
Good luck.