Fuel Line Choice and size

Stock fuel tank, or fuel cell?
My cell came with two -8 outlets, and I used to run both into a tee before the pump. New setup is a single -10 to the pump, -8 out to the filter, -8 connector to a 1/2 aluminum fuel line (probably overkill) -8 connector to the regulator, two -6 to the carb bowls, (or two -8 when I run the crossram.)
I run dead-headed, but a return should be at least as large as the supply line.
I have to replace a carlength of -6 braided line on my other car (previous owner) cause the rubber deteriorated, and now leaks like a sieve. Gonna use aluminum line on this one too.