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

Years ago I used to have the paint chip book for Martin Senour paints (NAPA brand) and they had the codes for interior and possibly the engine colors....not sure as I didn't look for it but I can't imagine it wasn't in there. My point is, maybe an old school body shop that has been around forever would still have a color chip book that would have the code? That is where I would start because yeah, the rattle can paints are not very good. It is possible that Autobody Toolmart may have it also, you might need to call them though.