A bit outside the topic window concerning first generation Camaros perhaps, but quite on topic concerning the 1966-1972 SCCA Trans Am focus of those so inclined.
The Unexpected Pony Car Site - the finest Ford Mustang vintage SCCA Trans Am website out there, based in Germany - a huge resource. Where it is the 'rival' enthusiasts come to know about discoveries concerning their scene. See:
The Unexpected Pony Car Site:http://www.ponysite.de/
The BOSS 302 Registry Trans Am Racing - stellar knowledge on display and on call concerning all things Trans Am Mustang. Overlap concerning other makes, various factory and independent efforts - hence little to ignore. See:
The BOSS 302 Trans Am Racing:http://www.boss302.com/smf/index.php?board=8.0