1970 dual snorkel air cleaner

[Mr70]

I've always believed the Dual Snorkle air cleaner was first destined for the 1970 LS-6 Corvette.
Once it was realized there would be no 1970 LS-6 Corvette,and it would be a later release date,
Chevrolet put the backlogged stock of these air cleaners on all the Aluminum intaked newly styled
L-78 Camaros,some of the remaining L-78 Novas & LS-6 Chevelles.From what I've seen,it seems
the cars originally equipped with them have their build dates fall between Jan.-July 1970 supporting this.
Has anyone seen proof of one on a vehicle earlier then Jan.70?