Holley black here with 3/8 line. I have had the Holley black pump on my 63 since 2011 and never a problem. I also had the Holley red pump on it from 2003 to 2011 and it also never had a problem. I have only use Holley pumps all my life and only once had a pump go up on my sons Dart which had the red pump on it and it went bad around 2010 and it had been on his car since 1997. Ron