When I swapped out my 258 for a 304, I made my own fuel line. It was much simpler than trying to piece together already made parts. Measure from the fuel tank, across to the drivers side frame rail, up the rail to the motor. Add a foot or so to that measurement. Go down to a hydraulic hose shop and get some stainless steel line. Have them cut it to your length. Stop at a hardware store and get a tubing bender and cutter (both are inexpensive and great tools to have in the future.) Then simply bend and fit your new line to your Jeep. Pick up some insulated clamps to fasten the line to your frame and your done.
If you need to make a pattern for a tricky bend, use a straitened out coat hanger to make a template. It will save you some time bending the tube.