It sounds like your options here are:
1) Spend ~$4,000 for a new-to-you used truck. In the end, you have a used truck, with an original engine.
or
2) Spend ~$4,000 to replace the engine (I second the suggestion to put a new Jasper in it). In the end, you have a used truck with a new engine.
As far as I'm concerned, (even if I'm off on the amount), dollar for dollar, a used truck with a new engine is better than a used truck with an original engine.
If you like the truck and it's in decent shape, I'd say have the shop to an engine swap.
-SF
1) Spend ~$4,000 for a new-to-you used truck. In the end, you have a used truck, with an original engine.
or
2) Spend ~$4,000 to replace the engine (I second the suggestion to put a new Jasper in it). In the end, you have a used truck with a new engine.
As far as I'm concerned, (even if I'm off on the amount), dollar for dollar, a used truck with a new engine is better than a used truck with an original engine.
If you like the truck and it's in decent shape, I'd say have the shop to an engine swap.
-SF