I've got 2 1980 regular cab table tops. Paid AU$300 and AU$800 for them over the last 12 months. One is a real sh*tbox, the other is in very near showroom condition. 300k and 250k kilometres.
I also have a spare sd22 engine which I'm about to put in a boat. All of them have the inline injector pump, and I have them running on waste vegetable oil instead of diesel. You won't find a better vehicle for running on this stuff.
As you said, they're not fast, but they just keep going and going (...and going.)
You should get another one.