i have an old carb that i think is off a pontiac gto. it used to be on a 67 gto. don't know if it was original to the car. I can't find any tags. the only thing i find is stamped into the linkage side of it and it say mfg. by carter for gmc. on the very back of it carb on the body is stamped J35 and beside that is the no's 7047687. that is the only ones i can find on it. is it a 67 or later year? can you help me out on this.