GM Sports has moved from San Jose to Stockton and have a new number
http://www.gmsports.com/
Also, not sure if it is important to you, since you're doing a pro-tour style restoration , but the correct color for a 68 GTO engine is the light metallic blue. You have, what appears to be GM blue from the late 70s
http://www.barrett-jackson.com/stagi...Engine_Web.JPG