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

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.View attachment 1715940343
I think that's purdy deadgum close.