Yes, your correct as far as i know. The black car is original paint/stripe, the guy owned for 30 years and i have early pics. My T5 car a friend owned in the mid '70s and only has the Barracuda emblem...NO FISH.
You can only go by original cars since so many had been redone over the years, i know a guy that has a white 340 stripe on red body fastback that is a survivor. I have pics of that somewhere, but don't exactly remember the emblems. I'll look around or contact him for pics.