What should be done with this 70 340 Duster

Question.:actually trivia.. When you do a rotisary restore on a car. Every screw and clip comes off. If you had two bare shells side by side that had the same options but one was a 340 / 383.

How do you tell which was the 340 383 shell?

There is a way and its not numbers , I was just wondering if others use this when looking for clones. I caught many and it is the only sure way. Even If its removed you can always see where it was. But it is very small and all 340's and 383's have one.