earl's, russell, moroso, the big names, all sell aluminum tubing that is lightweight, easy to use, and fairly inexpensive.
go to summit and type in aluminum fuel line. i think you can get 25 feet for under 25 bucks. you will have plenty of left over so you can practice flaring the lines.
'65 Fastback build in progress.
'67 Pro-Touring Fastback that does wheelies and gets 20 mpg.
October 2014 Mustang Monthly Feature Car