Here's the website I think Deuce was talking about. It is a C-5 set-up with a Viper differential built to fit early Corvettes -- good construction pictures. The link was buried in a thread titled "Vette Suspension in a Nova" in the suspension threads (Feb 7th by Sartran). That thread contains a pros/cons discussion of C-4 and C-5 based suspensions.
Good luck with your project.
Pappy
http://www.streetshopinc.com/c5andc6for53-82.html