6BBLLGT - That valve cover looks very blue to me. Every Turquoise big block I've ever had looked much more green (like the Alpine green) than any of these blue colors sold as "Chrysler Turquoise" or that valve cover. The paints sold as "Chrysler Turquoise" would probably be a close match on that valve cover. I honestly could not differentiate between that valve cover and 72 and up Corporate blue. But you are right, the aging does effect it.

One other thing - Mancini sells paint now that they claim is a correct match.