I used 3/8" aluminum from Summit on my Spirit R/T. Never again!! It corroded badly under the clamps that hold it to the bottom of the car. It eventually got so bad that I had fuel spraying out. The clamps were rubber lined steel ones from Summit and I think the dissimilar metals caused a reaction and pitted the aluminum line, but only under the clamps.
Have you heard of this stuff?
http://cunifer.com/
Looks like it would work great and be pretty forgiving on installation. I'm replacing all the fuel line on my Spirit R/T with this stuff or the 5' sections of 3/8" straight steel tube from NAPA. Not sure which I'll use yet.