It is a detroit diesel, 1969, I am not sure of the model, but I can find out that information, seller advised that output was approx 280 horsepower per engine. The one engine got hot, approx. 200 and we turned it off and an engine alarm sounded as well. The other engine, that has water in the oil, seemed to be operating properly. Engine oil in both engines was at satisfactory levels.
Replacing with a truck engine sounds like a great idea if necessary.