Build date
I am by no means an expert on production times. Don't claim to be. I would agree that most engines are built prior to the body/chasis time. However, there are too many examples of hold overs, special orders, and like mine, strikes at certain plants ( 1965 ) that could easily explain the 4 day difference between the motor and the car. Remember, cars use to be able to be ordered from the dealer, not just purchased what was on the lot, many were in fact ordered to customer specs not GM'S production line. Now I am not saying anything is right or wrong here. I just think that if the block is stamped with the VIN, chances are there is an explaination for it and it is most likely genuine. That being said, lets look further without predijudice. Like I tell everyone. I cannot PROVE ( Yet ) my 65 impala is a factory 409 car, however there is no-one yet that can PROVE it is not. It has everything the car should have per everything a 65 409 impala should have, however I have not done a title search for the original owner or second, and chevrolet doesn't keep records like Pontiac did, so who is to say? I am researching it though. Even with my car as a cover car for Super Chevy listed as a 409 impala, I still need more. Too many one offs, special orders, plant strikes, delays, clerical mix ups etc., to know for sure. And the dates are so close. Someone really wanted to fake that car if its not real, and what would be the advantage? It's not that special to fake? So why would they?
Jeff