What is the absolutely correct blue engine paint color for a 74 Duster?

cruiser said
Guys/Gals: I'll be pulling and repainting the slant six motor in my 1974 Duster soon. I've seen many versions of the blue paint used to repaint these engines, so which one is the actual correct blue paint to use on a St. Louis built 1974 Plymouth Duster? Seems like when I go to a car show, every Duster, Dart or Valiant has its own unique hue of blue paint. Some is glossy, some matte and some flat. There isn't any original paint left on my engine, so I have no point of reference, unfortunately. Does anyone out there know what the exactly correct factory paint was? Do you have a Sikkens or Ditzler code? Any and all ideas are welcome, along with your photos of your engine paint. Many thanks!

This is mine. I can’t swear that it’s correct. It was custom matched to cleaned up original paint that survived on one of the valve covers, but more than forty years of exposure to oil, grease, dirt and ultra violet light may very well have altered that sample. Anyways, it was the best I could do.