Hi, I have a 67 Malibu with a big block and long water pump. For years I was using an Impala 3 core but now switched to a 4 core stock oem unit. What is the correct part number for the upper hose? I have 2 from Dayco that look alike but yet have different numbers? 70344 and 70534. thanks in advance

Dan

Since I haven't got my original Harrison radiator recored yet...I just bought the correct reproduction upper hose on my 66 with a big block with a generic radiator and cut the length to fit...