first off it is a 22" inch radiator. here is the correct number you need for 1970
#2998945. now here are more that will work...1970 #2998944, 1971 #3443975, 1971 #3443976, 1971 #3443977, 1972 #3574636, 1972 #3574634 all of these are 22" radiators for 340's as well