I am looking for tips on getting the gas line and the return through my 72 tunnel. I did text and bug Scott Longballa on the best direction. Things I read say to attach the new line to the old and pull it through. With the 90 on the end do you push or pull it back to cut that off? What is the best way to attach the old to the new? Do I need to pull a seat? Any advice would be appreciated. I have both ends open. No motor and no gas tank. I had the suspension all put together but then thought better about leaving that 52 year old gas line so I took it all back apart. I bought new pre-bent lines. Thanks in advance for your time.