Thought I would Bring this thread back into the spotlight I recently found a video on YouTube where they briefly talk about the (General Motors "Jimmy diesel Engine" that will be adapted to all John Deere 440 Diesel Industrial Tractors) this film is mostly about the 1959 Industrial line from John Deere. Unfortunately the whole film isn't showcased that's how the original poster received it but they do talk a bit about the 440 diesel enjoy.
https://www.youtube.com/watch?v=bSCMiZCYNKo