My grandfather rebuilt a Buda out of a Gleaner combine, and put it into a 1979 Ford F-150. He did this in 1980. This was before Ford had a diesel pickup.
He made an adapter, and installed a turbo that was supposed to fit a Farmall 560 (it was a conversion as the 560 didn't have a turbo) and had a friend who was a machinest make a bell housing for it. He also put on a vacume pump for the brakes.
When he got done with a whole winters worth of work, it got 50 miles per gallon. It didn't have really great power, but it was more than enough to drive without a heavy load. The only problem was that whenever my grandmother drove it, she lugged it and blew out the head gasket. After the 2nd or 3rd head gasked my grandfather gave up on it, because it was supposed to be my grandmas truck. But he could drive it thousands of miles with no problems at all.
You should have seen the guys at the truck stops come running when he pulled up to the diesel pump. They would come running out telling him he couldn't put diesel in the truck. Then we would have to open the hood, and let everybody look at the engine.