Certain models of early FE powered pickup trucks used cast iron timing covers, especially some of the 4x4 models. Cast iron timing covers were also used on the 330 MD FT truck engines, that were used with the traditional FE style water pump. The Ford Truck Parts book unfortunately doesn’t provide a cross reference to the engineering numbers cast on the part, but I’ve seen a few pictures of that C7TE-B cover you have. Like you mentioned, it’s also possible it came from an industrial application, but due to the wide variety of industrial engine applications it would probably depend on what package the end user ordered, and how the engine was mounted. I don’t have a Ford Industrial Parts book to check any of those.