I've read that it is near impossible to remove and replace the fuel lines without removing the body much like the brake lines.  However, i replaced the forward to aft brake line without removing the body.  Is it not possible to just flex the lines to get them past the rear frame?  I just don't want to remove the old ones and end up for lack of a better word screwed!  I believe the lines are corroded and clogged.  I let the car sit to long without starting and the newer gas messed the entire fuel system.   Please Help!

 I have a similiar issue.... look under the Topic Titled "leaking fuel line" in the same forum.... from what I was told the body needs to be lifted to snake it through the frame... 

To route the line in the original location requires lifting the body, but it is possible to rebend it to run under the obstacles.  Or cut it and flare the ends, and put a quality splice in.

Larry