In the 80s we used to order drop in engine assemblies thru the assembly plant NOT the engine plant. I do not recall from my plant guide tour training. Best person for that answer would be Dave Cantagallo.
Ford Blue paint is all another subject. The best explanation I have was done by Mustangs and Fords a few years back
http://www.mustangandfords.com...ustang-engine-paint/
High end restoration shops have for years approached it differently, they thoroughly clean the motor find the best sample and mix paint to match.
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