Correct, they were not stamped. One has the gold tag marked 4846 (Can't remember at the moment if it was S or SA), the other has no tag. I was wondering if the one with the single straight boosters was a 1000 cfm, as I did read you could convert an 850 to a 1000 by removing the dual booster? Not sure how true that is. The single booster carb is the one that's apart, it is unfortunately missing some pieces. Thank you for the info though, you confirmed what I suspected on the kits. Luckily the main body gaskets on both are in good enough condition that I can make a copy.