Interesting that it has an engine block that was cast in Germany: GS = Gebrüder Sulzer.
The GS foundry that cast engine blocks and engine heads for Ford in Germany was located in Ludwigshafen on the Rhein River and shipped the raw engine blocks and engine head castings up the Rhein River to be machined at the Ford factory in Köln.
Perhaps the engine was swapped out at some point?
Brad in Maryland