i ran a 15 gallon cell in mine with paxton fuel pump, as for return line. i ran a new line from motor to the top of the cell. just put a balk head in it and conect the lines. also make a breather set up on top of the cell
his truck is a 2000 therefore hae has no return line comming from the motor. easiest way to do it is to use your stock pump/sending unit. get an aluminum cell and drill holes in the flange around the stock unit and bolt it down using a gasket sealer. it may require using a spacer depending on what pump you have. some motors and gas tanks' units are different in length. oh get a cell that's 10" deep. it should be close to the right depth.
My gas tank is in the factory spot but it is raised up! It's a whole lot easier than buying all that stuff and finding the correct fuel pressure for the truck! Believe me, I've been down that road before!!