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

Tanker said
For comparison, here are a couple photos of the slant six in my grandfathers 71 Satellite wagon. As it happens it's parked right in front of my hangar just now. This car hasn't been driven since the late eighties and it's been in the family since new, so i can guarantee it's never been repainted. Obviously this engine's paint has seen better days, but this looks nothing like the blue seen on the 360 valve cover above. Not sure what to make of that, but there it is.
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This is a 78 318 in a 78 power wagon I had, it had 49,000 miles, I bought it off the original owner, I did add the LD4B intake and carb, but original paint on the valve covers, it even had the sticker on the drivers side.