The non cuda model would typically have the Barracuda text emblem. The cuda models would typically have the 'cuda emblem.

However, I had a 1971 340 cuda from a salvage yard. It was a cuda, but had the Barracuda text emblem on the tail panel. It's the only time I've ever seen that on a cuda. I'm guessing a factory worker installed the wrong emblem. See the top panel in the photo.