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Looks like the darker blue they started using in the 70s. The earlier engine color was a bit lighter. It still looks like Ford blue - just the newer version.
Yeah, it's a bit on the dark side. On that engine, between the two inner spark plugs on each head there should be a casting number. It'd be something like D2TE-AA or something along those lines.
I think that's the "Ford Dark Blue" from the 70's as mentioned by Oppy. "Old Ford Blue" is medium while "Ford Blue" is pretty bright. I've played around with all of them. I use "Old Ford Blue" on my stuff. http://www.duplicolor.com/products/colors/highheat.html