Of the 600 L78 '70 (actually '70 1/2) Camaros produced, less than a dozen are thought to have come with the M40 T400 trans. option. There are 2 or 3 still in existence with with documentation. The most heavily documented is one originally sold through Scuncio Chevrolet in Rhode Island.
The line between 'available', 'produced', 'in the book' and 'accepted' has always been blurry. That line has been pretty well erased for many combos and mfgs.
Regardless, any 9 second 396-375 stocker is one bad azzed sumbeech!!!!