Noted Demon, I don't have the heads for this engine but have already asked for that info. As far as the blue vs orange engine deal, yes I'm aware of that. My effort here is not meant to set any standard, I'm just gathering information that will hopefully paint a better picture of how things (usually) were. The items lacking from the above list are only missing because this particular example didn't have any other original parts to pull date codes or other details (short of paint over spray, etc.) those have been noted in a different document.

Look at how some of the dates relate to one another in the above example; for instance, the engine was assembled September 14, 1970, and the exhaust manifolds were cast only 2 weeks prior, the carburetor was also built sometime in September, that's a pretty tight time window, yet the intake was cast all the way back in June of 1970!