Yep, they were what they were, with that 455 Stage 1 motor, Turbo 400, etc.....Dude , that's awesome , my uncle still has a saturn yellow 70 GSX...theY only made 678 that year .. and you had to buy them the way they were built they were factory production only ... There was no special order until 71.
But lots of folks at the time could not get their head around a Buick muscle car, they were a bit outside the norm. Sorry I have no pics of the GSX, but here's one of a '68 Wildcat I had a bit later on.