First 1967 383 installed in a Barracuda

Thanks for all the replies, but still no concrete answers to when the first 383 cars were built for the 1967 model year. Many people talk about November, also about the R&T article in August or September of 1966, in which they tested a 383 Formula S.
With all this info indicating early builds, why is the earliest fender tag build date March 01/67?
I've seen one other Canadian Export spec car with the same build date as mine, March 01/67.
All others are later in March, April, May and even June of 1967.
Did all the cars before March 1/67 fall off the planet? Or is the info wrong and they were built much later?? I know there was tooling issues and first builds (slant 6 and small v8's was on or around November 25/66. This is indicated from several reliable sources, including FCA.
Someone asked when my delivery date was, I have included a pic of my delivery date of March 10/67 as indicated on the IBM card.
So if there is someone that can for sure (not what some magazine thinks or their friends think) give info regarding when these were first built (someone worked in Hamtramck etc), I would really appreciate the info.
Thanks in advance to all that are helping.

IBM showing delivery date.jpg