I still have it. There are a few resources for these engines and some for new ones @ ~$7k so avoid those. Craigslist, ebaymotors, BinderBulletin as well as the LD28 forum. These are the only Internet resources I can think of at the moment.
The LD28 was used in several marine applications and aircraft tugs. The slightly larger displacement SD33/SD33T was used in the full size Ford Bronco.