Need help understanding date codes and sequence motor numbers

This is good advice. Am currently doing the "matching numbers" thing on a '68 cuda BB car. Am documenting all part numbers, casting numbers, dates, numbers/numbers/numbers, it gets crazy. In the end there is an overall pattern which is satisfying personally. The lesson though is that there are are so many variables we should never use that info to criticize another car. There are others in our hobby that think that we are totally crazy and I think they are partly right. Just enjoy your car wherever that takes you.