For those interested here is the dealer decal from Clark-Maple Chevrolet in Chicago that I said I would post.
After talking to my mechanic Gary today he told me that his late partner Frank worked at Clark-Maple for a short time before returning to Brigance. It seems that he left Brigance Chevrolet to follow Joe Seputes the Corvette mechanic from Brigance who aquired an administrative position at Clark-Maples service dept. Joe S is still with us and owns a shop called Veteran Automotive in IL. I have known of him for years and never knew that he was a long time Brigance tech as well. Joe preforms many NCRS level Corvette restorations today.