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

Well...I dunno, but Ill tell you I once painted a 318 Chevy blue because that was the only blue Duplicolor engine paint they had at Wal Mart and it was a budget build... Ive heard some say it was sacriledge so i then just quit telling people it was chevy Blue...the protests then stopped. Beleive it or not Chevy guys complained the most... :)