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

I don't know how close it resembles the true factory color but I've been very happy with the POR 15 engine and manifold paint. Brushed it on everything, even the valve cover. You can see some brush strokes on the valve cover but it did a pretty good job of self leveling so they aren't really noticeable unless you're up close. Would spray the valve cover if I wanted to do a bang up job.

The exhaust manifold paint is really nice. Has yet to burn off or discolor at all in the first couple thousand miles.