What’s the exact process to identify a real 66 Formula S Barracuda?

Amazing that we're still trying to decipher these things after 50 years.

I bought 66 mainly because it was unmolested.
273 2bbl
7-1/4" rear
factory 4 speed
13" wheels

I've actually never seen a factory 4 speed 66 with a console, but I had to add that...gotta have a place to put a coffee and plug in a cell phone