I will just add that NOT ALL Corvettes sell for Barrett Jackson cars sell for

In the real world it takes just the right buyer that wants the year and options your are selling to make it come true.
There are far more tire kickers out there that really don't know what a Corvette is worth, and others that call them selves experts :eyerole the truth is most folks fall in love with the allure of owning an older Corvette, maybe they fell in love in there youth with a 1970 Corvette or they graduated in 1967 and want one and can afford to buy it.
Unless an older Corvette has been taken care of and attended to any and all issue's that has occurred over the years, well let me put it this way, problems don't fix themselves
Collectors NADA says my 1981 4-speed low mileage is worth about double what I figure I might could sell it for IF THE RIGHT PERSON comes along...
I've owned Corvettes since 1978, front clipped a 1974, did most the mech work on my 81 and still have over $30K invested in it, and never drive it :eyerole
The only Corvette I made money on was a 1954 basket case a buddy and I went in halves to buy back in 1980 we had it assembled enough to look like a 54, but were redoing a Blue Flame 6, the car had a 283 4-speed :eyerole, Long story short we used it in a Corvette Evolution Show back in 1983 and we sold it AS IS for FOUR X what we paid for it ($4,500)...
Just say'n

Bud