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FYI....
According to the Chrysler Production Code Book Tenth edition (Galen Tag Service):
1968 Barracuda Hardtop 383 Formula S 252 estimated built
Hardtop 383 Formula S 4 Speed 153 estimated built
Hardtop 383 Formula S Auto 99 estimated built

Went back and saw your production numbers, which I like better. Anyway you look at it there aren't very many still running.