1967 formula S convertible production

I have a B7 blue 67 Barracuda convertible Formula S 383 4 speed restored back to nearly original condition.
I've been told by several Mopar guru's that because they had engine installation on the production line the 67 383 convertible numbers were weak
A registry currently shows 14 67Barracuda 383 convertible and the thoughts of many not a whole lot more were made.