Stefano -
This may not be the car you are seeking info on but there can't be too many Fathom Blue L78 converts roaming around. This is the 2nd one located in Des Moines that has hit ebay in the last 30 days (2 different owners). The red one on this thread being the other. This owner has a couple of other nice ones listed on ebay as well. I may have to take a peek at these cars next weekend.
http://cgi.ebay.com/ebaymotors/Chevrolet...1QQcmdZViewItem