390 double pumper vacuum

Out of curiosity, where are the list numbers on the carbs with no choke airhorn, like the o.p's?
I've got an old gold claw, a proform and a brawler, all without the choke horn, and the serial numbers are all in a different place.
Stamped "somewhere" on the metering blocks and main bodies. Usually on the top edge of the metering blocks and on the side of the main bodies.