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In the "corvette black book". They have compiled data where in some years they have listed the serial numbers of the cars that were the last one of that month. Look into it there and it may help you out.
"DUB"
On my car, there is a sticker on the side of the driver's door (next to the latch). It shows the weight of the car and the month it was built. (03/76)
Your car may have a similar sticker. If you are trying to find out the specific day it was made, that is another story. Not sure if those records are available.
All C3 Corvettes have a trim tag riveted to the driver's side door pillar. There is a code that can be decifered to give the assembly date range. On an 82 this is the top line of the plate. What does it read?