8.2 Detroit diesel
 

I like the idea of the v-8 diesel. We had them in 5 and 6 ton trucks when I was working. The trucks were very good on fuel and these series of diesels were named “fuel pincher”. It was common to have fuel economy in the 10 to 12 mpg range when running at a steady 80 to 90 km/hr. I think you may be very pleased with your choice of power train.

These engines have reputation for having short lives. If turbocharged, they went through headgaskets at 20,000 miles. Non turbo were longer. The blocks were poorly designed with no support at the top of the cylinders. GM quit making them after 15 years or so. But as I said earlier, they are plentiful right now from the scrapped mlvws, and with the limited mileage of a tracked vehicle should do alright.