Here is another link to pictures of the Nickey, and also the Yenko in this discussion. For what its worth, I have the assembly manual for the 69 Nova, and the assembly instructions for L48, L34, and L78 all point to instructions for adding the SS trim. Including the hood. But thats just the instructions, who knows if they were always followed or not.
http://www.sonic.net/bbdon/features/jax/jax3.htm