That's a great engine! It is made by Internationl Harvester for their medium duty line of trucks so that eninge is available everywhere! It's in their garbage trucks, box trucks, school buses and many other applications. Not only that, it has a long lineage of good engines before it that kept getting better
Beware that they tend to eat automatic transmissions. They are too light duty for that much torque. That's the weak area in most diesels put in pickups and needing a rebuild at 100,000 is not uncommon. You'll need to have a fund to get the trans rebuilt. When you get it rebuilt they can beef it up and it will then last a very long time, but it's expensive. So, have a mechanic who knows those trucks look it over, especially the trans.
Do the research on the price, but that sounds like a very good deal to me.
Bob