fuel line

.....can you single flare copper line and use AN type fittings?.......
I've seen plenty o' aluminum line in my days on street cars.......
another option would be the "push lock" hose. it is relatively inexpensive and tough as nails. I know my bud used some on his car, try to put the ends on the hose, wow what a beotch, we finally boiled some water and heated the hose end, the fitting went right on. WE used the stuff from speedway catalog. Good deal. maybe a combo of aluminum and pushlock hose is what I would use. the hose would prevent any work hardening as stated earlier. steel is good too but can you single flare it and use an fittings?