BJT, you scored.
This is the kind of truck I have been looking for - and which I never found. I agree with adding a hard top - also from a user standpoint, a soft top on a dump truck is just...wrong. Even though it does have the headache rack, I would still want a (thin) sheet of metal over my head!
That the truck is quite complete, with the curved fenders, is great, too. If you are patient, you can score troop seats and a vinyl cover for the bed (they do crop up once in a while and they do not fit anything else but the dump truck). Not because you would need either one, but because it makes the truck even more rare, being complete with the accessories!
Now you need a front PTO and a winch..and a new data plate for a 342 w/w
Good luck with it and post pictures of your restoration/upgrades!