Getting fuel return below the fuel level is not hard at all, even in a plastic tank.
The '71 truck has a plastic fuel cell, when I swapped to EFI, I drilled a hole high in the tank, to avoid any leaks. I used a bulkhead fitting for -6 tubing. Inside the tank I added an extension, that had a 90* bend in it and ended the tube about 1/2" from the bottom of the tank.
In my boss' '62 Suburban, when I swapped it to EFI, I added a return tube to the sending unit, that extended down and was attached to the side of the pick up tube. This one also ended near the bottom of the tank.
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