Really is pretty remarkable how uniform and complete Johnson's landslide was. Really shows just how toxic Goldwater was to the entire country, even the deep south. It's pretty obvious that he only won those few southern states off of what were essentially single-issue racial segregation voters at that point.
The Sixth Party System equivalent would have been something like the Democratic Party nominating Bernie Sanders in 2004.
1964 is one of my favorite elections to analyze and read about, because it's the last time that the Democrats won a landslide and carried several states which will probably never vote Democratic in my lifetime.