Engine date vs Build date

[x33rs]

I think my 69 Z is very similar. It's a Norwood 12D build and I think the assembly stamp on the engine is near the very end of the month of December. According to the serial number I think William told me my Z was actually final assembled 1st week of January.
Kind of interesting my serial number is about 500 numbers beyond some 12E builds from Norwood, which the first ZL1's were I believe. So my Z was scheduled a week before but came out about a week after the 12E cars. There was a hang up somewhere. Interesting stuff.