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

The mopar performance spray cans were a damn close match to the original. Problem is their spray cans have issues. I have had a dozen that I could only get half the paint out of and even a couple that would not spray at all. The last few cans I bought seem to be much better so maybe they moved on to a different supplier for them.
Next engine I do will be base/clear. I spayed some low sheen clear on a 4 speed the other day and it turned out good.