Yep, looks to.me, that if you have a hose going from tank to plastic tank, then a hose from plastic tank to filler neck, your vent is not venting and you could encounter vapor lock. As others have said, plug the line exiting tank, run filler neck line to outside trunk atmosphere. Some gas smell in garage but not in trunk. Be sure the return line itself is plugged, from under the battery where it starts and also where it ends the trunk.
As for fuel pump, a debatable item but if you stick with electric, check to see if an inertia cut off switch is installed in the event of an accident, and consider ordering/carry a replacement pump as they fail without notice. And it depends how noisy it is to you and how "original" looking you want the car.