I bought a couple of "junk" Q-Jets at a swap meet and after cleaning one up, (it appears to be a 71 Pontiac) I noticed that there was no ID number stamped on the carb. I cleaned it really well and put it under high magnification and there wasn't any visual evidence that there had ever been a number on it nor were there any kind of marks that would have indicated someone would have tried to remove the numbers. Were any Q-Jets sent out without a stamped ID?