I think I may have posted these photo years ago when I read Unfair Advantage by Mark Donohue. They swiss cheesed the inner fenderwells and doors for free flowing air on the Sunoco Camaro

http://www.camaros.org/forum/index.php?topic=8485.0

 Holes were also incorporated into both ends of the door and through the rear quarter panel and into the rear fenderwell.

http://www.camaros.org/forum/index.php?topic=8328.0