No such animal. It doesn't have any of the GS features.... heavy duty frame, suspension, rear, or ornamentation. It's just a Skylark with a 4 speed swapped into it. Looks very nicely done tho!
I already said it was never badged as such. BTW, what "GS FEATURES" did a 67 GS340 have? I was a stripped down Special with a 340 in it and a slightly larger sway bar in the front, no boxed frame. Tell me what these "GS FEATURES" are. I did read somewhere that they made some GS340s at the end of the 66 model year and never badged them.