Gotta love this SS/GA Dart

Ed,

The way the formulas work, Stock and SS don't put the same combos in the same letter catagory.

SS/GA would have 440 6 pack cars in bigger, heavier vehicles, like E and B bodies. But like Challengers and Cudas, you usually see the 440-6 cars in SS/F(A). One can add weight to move down a class into SS/G(A). G/SA usually has early '70's A-bodies against some small block Camaros, depending on HP rating.

Not sure about all the "other" brands at the moment.
This does change from time to time when a particular combo gets "factored" and has HP added to their rating and possibly bumped up a class (i.e.: H to G) when someone figures out how to get it VERY fast under the index. NHRA has a (controversial) formula to determine that too. Some combos can also get HP taken off by lobbying NHRA and proving that it is over-rated to be competitive against other like-classed cars.

Cool car nonetheless! Definitely different.