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

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

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

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