Thanks for the information on fuel delivery. I was wondering if that would be a problem.
At the moment I am planning to use a fuel filler I salvaged from a new model Chevy truck. One of its benefits is the fuel delivery goes through an interior tube that allows air excaping the tank to exit through the filler opening around the outside of that inner tube. I am not sure how I am going to position the filler relative to the fender surface. The truck it came from had a plastic piece that positioned the filler more vertically behind a door. I don't plan on a hidden/door arangement but deciding how vertical the filler needs to be will determine where it will be placed on the fender.