How do you guys keep gas from spilling? 66' Dart

I got a nice new shiny tight gas cap "shout out to sjd234 on Ebay."

However because the gas line is parallel to the ground and not slanted upwards like in modern cars, everytime I fill up as Im pulling the pump out, gas spills onto my back quarter panel. Any have tips on avoiding that?
I got a gas filler restrctor (here) pollutioncontrol2 which helps by adding back pressure to the gas pump nozzle and acts like a newer car does, it has been on my best friensd car for over 3 years now and not one spill yet other than he didn't have the nozzle in the opening and pressed the lever (DUH moment for him, watching a girl and not the nozzle). Also a new cap repop from SlantSixDan which works awesome and I should have bought 2(1 for the wifes dart)