yes I agree with that statement, and it could be very possibile that someone has assembled this strange combo of parts for some reason like they had some good parts so they used them. The engines short block and head casting date codes would match quite closely and roughly be within 2 weeks or less if the engine was still as Ford originally assembled it. After this many decades since Ford Designed and Manufactured these parts, plus their use since it isn't going to be as easy to know.