My truck is an 1980 Chevy C20 with a 454 that was transplanted in the early 80s, and a standard transmission. It had been sitting up for at least 8 years with both tanks full of fuel. Since I finally got both tanks emptied today using the mechanical pump, and running the motor off a jug. I decided to replace the tanks instead of reusing them. That way there is no doubt of their condition. Since I'll be replacing soft lines and blowing the hard lines out after letting some marvel mystery oil sit in them a few days. Should I go ahead and put a new higher output pump on, and should I get one without a return line? Do plan on getting a different carburetor to replace the quadrajet later on.