This truck was and is beat up. I have installed several items that were no longer there because they had fallen off under the previous owner's use. Other than that, I would say the carburator has been the most troublesome. All of those vaccum lines and attachments are a real pain. I currently have it rigged so that it runs just fine. it currently diesels when I shut it off. A new carb would be a Godsend. I really can't say that anything else has gone wrong with it other than the fact that it doesn't heat very well.
I have been a devoted European car fan since high school. I never thought I would enjoy a beat up 4x4 so much. Sure it's beat to a pulp, but it gets you were you need to go. It will also get you were you don't need to go. I have 33" tires under it with the stock suspension. There is a lack of top end power because of that. I use low range off-road to compensate. The ride of the solid front axle is bone jarring. All in all, it's a little like a tin can sitting on top of an Army 2 and a half ton truck. I hate to admit it, but I love it.
I would look at your timing belt or chain for the dieseling problem it could be off in time or ready for a new belt or chain. If the belt breaks it could cost you a motor.