If I were to run a stock tank and EFI I would use the Holley Hyrdomat, its not cheap but proven to work.

I made a customed baffled sump for my stock tank and while I have never lost fuel pressure its crazy how much I can hear the pumps change tone with slosh on a low tank. I run two Walboro 255lph mounted just behind the tank, they are a few inches above the outlets on the tank and I am going to try going a little lower to see if it helps.