Copper fuel lines are best left to the early-car concours-restoration types.
You can use Bundyweld or Cunifer if you'd prefer not to use aluminum.
Bundyweld is rolled sheet steel copper-brazed along the seam and corrosion-coated, Cunifer is a copper-nickel alloy tube commonly used in some Euro cars. Both are about equal in strength, about equally easy to work, the Cunifer might be just a little more corrosion-resistant but it's also considerably more expensive.
Bundyweld available pretty economically in rolls from NAPA or from McMaster-Carr. Cunifer comes from http://fedhillusa.com
, there might be other sources.
This is 3/8 pressure and 5/16 return plumbing on my '65 Mustang convertible EFI conversion done in Cunifer:
Don't much like having the lines in the tunnel but there really isn't anywhere else to put them on a convertible; at least I got them away from the rear U-joint, and the front will be protected.
I much prefer the GM fuel filter over the Ford stuff (in this pic the filter mounting clamp isn't in place yet.) Both Bundy and Cunifer are hand-formable - for forming the line to conform to floorpan curves find some firm rubber sheet (floor mat, whatever) 1/4in thick or so, place it between tube and floor, and push. Nice constant-radius bends require a bender, of course.
I'll probably be doing the '64 wagon in Bundy for cost reasons.