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The newly painted covers are in the foreground. The 455 is in the background. The VCs on the engine (original factory paint) came from a 1976 Cutlass...unsure about whether this darker 1976 blue is worth paying attention to in a conversation about Big Block paint colors.
The wire looms are from the 1977 Pace Car that is destined to receive the 455. They are a different color than the 1976 Cutlass VCs...closer to the NAPA paint color for sure.
I painted my 455 with ew ceramic engine paint from eastwood (777 51683zp in rattle cans was a spot on match to the org eng. color NOT CHEEP but worth it for match. call them they were very helpful eastwood.com good luck
From your photo, the valve cover looks a too light and doesn't have the aqua hue to it. The cap for their can looks like the correct shade though. This is Fusick's blue on a '72 W-30: