As for VIN'S.....1981 the industry changed to a standard 17 digit standard format for all manufacturers. Some had switched prior knowing it was coming. Corvettes changed in 1981 as far as I know.
In a standard 17 digit VIN: (might be corvette specific for some)
Digit #1 = Country of Origin
Digit #2 = Manufacturer
Digit #3 = Make
Digit #4 = Car line or Series
Digit #5 = Specific Infor (Manufacturer Choice)
Digit #6 = Body Style
Digit #7 = Restraint System
Digit #8 = Engine
Digit #9 = Check Digit (generated based on all other digits)
Digit #10= Model Year Code
Digit #11=Assembly Plant
Digit #12-#17 = Assembly Order
This would imply: 2BGV071043S422188
#1 = Canada
#2 = ?
#3 = ?
#4 = ?
#5 = ?
#6 = ?
#7 = ?
#8 = ?
#9 = Check Digit
#10 = 1973 (typical tables only go back to 1980 so not sure how they picked this)
#11 = St. Louis
#12-#17 = Build Sequence
I can't match 2BV (first 3 digits) to any known World Manufacturer Identifier (WMI). VIN's starting in 2 are always Canada origin though. Chevrolet's built in Canada should start 2G1. Digits 4-7 are company specific choices so it is impossible to say what they mean without knowing a manufactuer
If the VIN followed industry standard format it would be something like: (keep in mind this would never have existed because GM wasn't using this VIN format in 1973)
#1 = 1 - USA
#2 = G - GM
#3 = C - Chevrolet
#4 = Y - Corvette (Car line)
#5 = Y - Corvette (series: Base, Z06, Zr1, etc)
#6 = 2 - Coupe
#7 = 3 - Manual Seat belts (might have been a different number)
#8 = J - Base 350 4 BBL
#9 = Check Digit
#10 = 1973 (typical tables only go back to 1980 so not sure how they picked this)
#11 = S - Built at St. Louis
#12-#17 = Build Sequence
It would be safe to say that this VIN was made up by the BC government and doesn't actually mean anything when it comes to each digit other than #1, #10, #11 seem to line up with Canada, 1973, and St. Louis assembly plant. I would suggest you will find much more use from the original GM VIN. Only issue is finding out whether it is original to the car......
hope this didn't make things worse in your mind.
T