I recently replaced the front-to-back brake line on a 64 conv. Just put the car on 4 jacks stands and slide under. No issues. The gas line will be more difficult because it routes inside the frame at the front and makes two turns inside. I would suggest forcing a stiff wire through the frame first. Then put 8 to 10 inches of the wire inside the head end of the gas line. This will guide the end of the gas line forward and exit the frame at the proper place rather than getting hung up.
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