'67 Barracuda w/360

get a standard 22" a body 70-up v8 rad, take it to a rad shop, have them go 3 row, hi efficiency core (3/8" tubes on center not standard 1/2" on center) and you will be set. if you are running dissimilar metal ion your engine, use a RADCAP brand radiator cap that has a zinc anode to prevent electrolysis.