I believe that Rick and Howard and others tried to help the Dodge Shelby owners set up a club and registry decades ago but it never matured or lasted. The folks at Team Shelby have tried as well. Obviously not enough survivor cars and volunteers to make it happen.
The TS group does get occasional posts on their forum site from a few current owners. I am not sure that there are boxes of records that have been kept as there were at the original Shelby American. Plus there there is no competition race record or list of workers that assembled the original cars, I believe. Maybe someone knows more about the production information here.