65 barracuda gas fill issue

1.) Hold the nozzle upside down when you fill.
2.) Add a fuel restrictor to the fill tube.
3.) Add a larger vent to the tank (generally done in conjunction with a rollover valve).
4.) Have the fill tube modified (Layson's used to offer this service, don't know if they still do).

The reason it splashes back out of the tank is because most pumps are set too high for our cars- the displaced air in the tank can't vent out fast enough, and the fuel burps back out.