I stepped down from a -10 feed for the carbs to a -8 which splits into -6 to the TB's, I made the return lines all -6. It idles great, is nice and crisp. Reading the literature it suggested running the power through the FITech computer to the in-tank pump. The way I read it the computer will control voltage to the fuel pump to help regulate the pressure.
The Fuel command centre would be nice if you don't want an in-tank pump I suppose, I can't see any reason not to run an in-tank pump though.

Sheldon