fuel line question?

[brandonc707]

I am looking at replacing my entire fuel system and all fuel lines.
I am looking into instilling the fitech efi and have a vapor works tank. wondering what size lines to use for the supply and return as well as line types? I currently have a sbc with about 450hp but would like to size the lines for a 600+ hp LS motor in the near future.......
i have read that the standard steel braided line is NOT the way to go, so i am thinking hard lines with the ptfe an hoses at both ends.
do you guys think 3/8" would be enough for the supply?or should I go 1/2"?
what about return line size?
any other suggestions?
thanks in advance for your help