Hard to say build date, there should be a trim/build tag on the firewall with an approximate week code. USUALLY, they didn't let them sit around at the plant more than a few days. My '70 Chevelle final build day was May 4th and the ship day was the 5th, but there could be extenuating circumstances for a delay too. The NCRS data report has some of that on it along with the assigned dealer.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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