Just a question??? Do you not have any of the original fuel line pieces?

The tank you ordered is set up for the standard hardware and line to run from the bottom of the tank threaded port along the passenger frame rail to the fuel pump on your 6 cylinder engine (identified in previous posts). All of those pieces are reproduced and can be purchased from vendors such as
Jim Carter Truck Parts.

EDIT: Otto beat me to the post button - lol!