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Karmen, here is a link too the glass codes you are looking for. You will find these codes on the lower corners of the glass. This site also has other additional numbers that may be useful. http://rowleycorvette.com/stats64.html
ng is Jan 64, vc is Dec 63, yc is Oct 63, tc is Aug 63. NCRS allows up to 12 months for glass date preceeding the car build date.
All the dates you have given are just fine for any vette built after the end of Jan 64
Your cars build date is within a day or two of the date embossed on upper left of your Trim tag, Letter followed by number.
Could be something like G20 or something similar.
My build date is E24 (Jan 24), right next to Detroit below.