one of the paint charts I have says (not sure of accuracy, just listing the reference I have):
170ci - 1960 = turquoise (exc valiant)
170ci - 1960-69 = red (valiant)
198ci - 1973 = blue (all)
225ci - 1970-74 = blue (all)
my '70 Barracuda w/original 225 (never rebuilt or modified) is blue...