This is how I lifted the body on my Chevelle to install a 1 piece trunk floor, that I had been told wasn't possible with the body on the frame...
I used 2 floor jacks with 12" long 2x2 boards under the rocker panels and removed all the body bolts but the front 2, yours will have 4 and I would only leave the 2 inside in but loosen them a couple turns. I had the body about 8" above the rear crossmember. In the second pic, you can see the fuel line on the right side, yours will be on the left, but same configuration.
Your new fuel line with come bent in half for shipping so you may be able to open it only enough to snake the rear, over the frame, section in place and then work the front in as you straighten the rest, like 67SS4speed suggested. The rear section does take a hard turn back toward the center of the car and you may need to straighten that some to get it over the frame and then re-shape it to point toward the sender.
If the body mounts are deteriorated, this is a good time to replace them too.
We have a lot of folks in the Chi-town area who may be willing to help with this, if you are in that area. Unfortunately, I am 8 hours away, or I would bring my jacks and help.