You have the Canadian 216 with the short side cover. If you have a crack in the head, those heads are hard to find. So that may be something to think about. I have the same motor and it took me several years to find a replacement head.
I think you have a good old truck there. You can buy a lot more of the running gear for the 1/2 ton than you can for the 1 Ton so that is a good thing.
