Mopar newbie with 65 V8 Barracuda

Welcome!
If your car has a four barrel and has a tach in the dash, etc. It is a Formula S. The fender tag will have a 312 code under the ABC. The emblem will look like my avatar. It may also be a Commando V8 emblem if it has the commando engine but no tach.
In short, it is either:
a) a V8 emblem
b) A Commando V8 emblem
or
c) a Formula S emblem
Very nice car! Enjoy!