Well after this crazy busy summer, I'm about to order the Sniper. Did tons of research and changed out a few items that I will order. Going with just the efi unit and the gas tank from Holley that comes with an in tank pump and a fuel level sender. The fuel line kit(s) are for 1 line or 2-return style--- Watched a lot of videos but cant seem to make up my mind if I want a return line or not. Any advantages or disadvantages to either?