Why are you wanting a new fuel tank...............is your tank bad? If you are talking about the fuel return line going into the tank, you can use a Classic Instruments fuel sender that has the return line already attached to the sender.................it goes right in place of your original sender and you can attach the fuel return line to it..........................I don't know of anyone that makes a new fuel tank for a Maverick that has that feature.
They will make it for either........................it's what I used in my Model A Coupe's tank which used a GM type sender.
I built this one for my EFI... the return line connector was on the e-fuel pump... http://mmb.maverick.to/showthread.php?t=75382