I did a quick ebay search, and as a close example found a matching #, 4 speed car with 2 buildsheets, older 90's concours frame-off resto sold at $65K.
http://cgi.ebay.com/ebaymotors/Chevrolet...bayphotohosting
Here is another one, older resto LS-6, 4-speed car sold for $45K on EBAY in June.
http://cgi.ebay.com/ebaymotors/ws/eBayIS...p;category=6164
These 2 examples are from EBAY for cars that were available to the masses. The point is there are deals out there if you look around, are patient, and purchase from a private party. The LS-6 cars are relatively plentiful and every nice LS-6 coupe has not been selling for $100K+ though certainly some apparently have.
last one: Here's a fresh resto, matching #'s w/buildsheet sold on this site for low $70's one week ago.
https://www.yenko.net/ubbthreads/show.../page/2#162209