If the '64 engine is the same color as a '67, here's a recipe right from Dupont. It's the correct Dupont turquoise paint recipe for '67 440ci. engines.

758 23.5

747 24.8

720 27.8

705 70.0

721 127.9

742 277.3

700 469.5

Still the correct mix for the Turquoise Paint Color....