It looks like Superformance has received GM's blessing with their Grand Sport replica. It is being represented as an "Official GM Licensed Product".
Check out the logo on the upper right hand of this page...
http://superformance.org/supernews/g...roduction.html
I have seen some beautiful GS replicas at Watkins Glen over the years. I took some photos of a GS (replica?) at the Watkins Glen vintage races in September 2006. Anyone know if this was one of the orginals?