No leather or A/C, and not original paint, but 72 LT1:
http://cgi.ebay.com/ebaymotors/1972-Chev...=item46139fbd58
Maybe the one you are looking at is worth almost double given it is an original paint car. C3 Corvettes are still not bringing much compared to the mid years. I think 50k is at the very top.
Personally, I think the 68 - 72's are undervalued today. I have always liked them.