Here's a couple shots of the paint codes applied to the rear end, and the casting numbers on my son's '68. One owner original and untouched.

Axel Number: BP 0327G1

http://i6.photobucket.com/albums/y210/Supertrunk/68%20Camaro/RearEndMarkup.jpg

and

http://i6.photobucket.com/albums/y210/Supertrunk/68%20Camaro/PinionMarkup.jpg

Hope this helps you folks out.

Thanks for the axle code and the pics. :)