1987 ford f250 xl 4wd 6.9 diesel

I bought it at an auction after it was sitting for 6 years. It would run great down the highway, but put out white/gray smoke, sometimes more than others. I was told an injector pump will cure all that.
I have not saved enough to do that yet, and it is doing some different things now, so I parked it. It needs someone with the funds and knowledge of that motor of which I have neither.
Now when I heat the glow plugs I hear a clicking sound under and behind the air cleaner. It did not do that before. It also really sputtered and surged a few days ago when I started it, which it also never did. It will start and run, but I have no clue how good and how far until someone gets this fuel system straight.
Here is the deal with the rest of this ol truck.
Really decent tires.Gooseneck and receiver hitches.Odometer reads 9488, so I do not know actual.From the condition of interior, I think it could be 109k, but I can't confirm.Seat not ripped, one small crack in dash.Heater core is bypassed right now.Has some kind of aftermarket OD, but I never messed with either because I never pulled anything.4wd works.One small spot of rust on rear which is odd because the rest of the truck is bone dry.clean wyo title
Ask anything, I am not trying to hide stuff I just don't know what else to say. I feel there is still plenty of life in this truck if it gets to someone who can give it some attention.
Rob 9708207669