'64-'66 Barracuda 273-2bbl air cleaner needed

No, Mark, the CAP and non-CAP cars got the same air cleaner (w/snorkel); the difference was that the CAP air cleaner had a breather tube fitting on the snorkel and the non-CAP air cleaner did not. (the highlighted FPC section is from '65 -- the CAP/non-CAP info starts in '66)
You're right, I don't know what I was thinking when I wrote that. I've seen both snorkle and unsilenced with and without the breather fitting. I don't remember seeing an unsilenced with the band clamp though....only the snorkle type seem to have that. I've had Darts, Valiants, and Barracudas with both types of air cleaners. What determined the type air cleaner that was installed?