Rick:
If you like it, then put it on! Freedom has outlasted Fascism, and is the proven way to go.
I too sometimes disagree with some NCRS fine points, but "Nazi" is way too harsh IMHO. If you are not FULLY aligned with their philosophy, then don't have your car judged, plain and simple. I would never have been able to complete my beautiful restoration without their help.
Okay, even though I disagree with you, I'll still try to answer your question.....NO!! Chambered exhaust was never offered for 1963, and never for an undercar application, like the Camaros. The only chambered exhaust offered in midyear Corvettes, was sidepipes, from mid 1965 to 1967.
Be forewarned. Even though the chambered sound sweet, there is lots of restriction inherent in the design. The off road (N11) exhaust will pass NCRS muster, and have less restriction, but IMHO does not sound as good.
Joe