I don't know if it was made by Pontiac but my boss when I was in high school had an IH with a cut in half v8. It was upright, not laid on its side. He got a good laugh at my jaw dropping when he opened the hood. Looked just like someone made it at home with a Sawzall and welded a plate on.
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Sounds familiar.
http://www.tractorbynet.com/forums/related-topics/288183-triva-fun-post4287438.html#post4287438
Bruce