Hey Brian and Sam,
Thanks for the responses. I should mention that I am focusing on V8 engines only. The more precise question is, were they all Ford blocks with interchangeable parts? Or were they completely different, as was the case for the GM BOP engines?
Brian, if your brother has the info, I would love to read it.
As an added note, I'm just asking this for a personal research project. I'm not working on anything. I plan on asking the same questions for the Chrysler and companies in a separate thread to avoid confusion.