school me on differences between Dart, GT, and GTS?

Lonewolf3165 said
'67 & '68 270 could be had in a hardtop as well. Not just pillar cars. .

correct ....I think I worded it wrong to make it seem as though a 2 door 270 would be a pillared car only.....that is really bad for me to make that error because my own car is a 68 270 hard top #-o