My bookmarked link indicates that the page is now long gone, but I remember a page about a guy who put a small John Deere diesel in a '59 Ford F-100. I think he picked the engine up from some salvaged ag machine, but I don't remember anything about the engine specs. He did use a Clark 5-speed with overdrive out of a bread truck. As I recall, his assessment was that it was good on fuel mileage (about 20 mpg) but it was also very slow, and I think maybe 65 mph was maximum.
