Thanks, JohnnyC. I'm hoping to find out if I can use these parts or not. I don't think that just because both older ECM's were superseded to a newer part it confirms that the older parts are interchangeable. The new part may be compatible with both old systems, but each old part may not be compatible with the rest of the system. I hope I'm explaining my question properly - I'm getting confused just trying to frame the question!
By the way, back in college I had a '65 Spitfire. It was fun car (when it was running right
)