In my area, that SprotTrac with a new engine would sell for about $4,500 because people are stupid about trucks around here. I used to own one. Bought it at auction w/ 150,000 miles for $4,000, moved to my current location, took the odometer up to 190,000 miles over 5 years, and sold it for $4,800. I was ... amazed. If your area is just as stupid, then maybe replacing the engine and selling it is the way to go.
I used to own trucks, because I also liked the convenience of having a truck. And then I learned about rentals. I now rent a full-sized pickup for a day for between $30-50 depending on how far I need to haul stuff. I could do this once a week, and it would still be cheaper than owning a truck, no matter how cheap I bought one. I only ever need a truck one or twice a year. My wife's tiny little Kia Soul hauls a whole bunch of crap, including lumber!