I don't know what it looks like.
As many others have said, LONG is a good guess. But I've never seen a LONG with a hood that sloped like that one.
Even today, some of the LONGs look very much like Ford, and Ford/NH tractors. The colors are right for a LONG. There is just something about that slope near the front of the hood that makes me question it. Could be that I've just not seen one. But I am skeptical.
Are there any markings on the engine to determine who made the engine?