fuel pump push pull question school me

Bigger lines; we were told by Dan Dvorack that bigger=head pressure. While we were talking, he had his last Lawman, 64 Beledere, hemi, on a lift; it had 3/8 braided. But Dan starts talking faster when he sees you eye-balling his old secrets, dunno.

On the 440, he said use the 5/16".