Truck looks to be in pretty decent condition. A piston/sleeve for that engine goes for around $70 so you'd should subtract that from what you would expect to get for that truck if ran and everything else was in working order. If everything else on the truck is in working condition and there is no other maintenance to be done aside from the rebuild then I would say start around $240. IMO you should buy the piston/sleeve and offer it up with the truck without installing it and try to sell starting around $320.