[vernonestes]

I cant say i am all that sure of what you are asking. I think you want to know how to tell for sure so here we go.

Here is a thread from a month or so ago for the 66 manual......
1966 GT 350 owners manual

As for the 65...it is the easiest of all. On the originals, the front and back covers fold out like a centerfold. The back cover foldout was the gt350 owners club registration form which was never started...this was perferrated so it may have been torn out. No reproductions have the fold out covers.

Hope this helps...
Best Regards,
Vern