I hate to say this, but...the value of a car based on "what you are seeing" vs. what you'll actually get, cash in hand, is very likely a different story, especially with Corvettes. I've learned that the hard way with a few cars that I had whose value I could swear were very high, only to be very disappointed at the time of sale.
No disrespect to your ride whatsoever. I had the same gen Grand Sport and loved it. It's a beautiful car. But the majority of buyers aren't going to track their car, so an engine/transmission combo doesn't really factor in to their purchase and I'm not sure they'd be willing to pay more for that.
Perhaps I'm wrong, but I don't think I'm too far off.
