kz750 carb identification

i'm trying to identify a set of kz750 carbs i have. i know the carbs came off a 1980 kz750 twin. i was told that there are numbers on the carb bodies but i dont see any. does anyone here know exactly where i should look for this number?

The numbers should be on the right side of the carbs. They are stamped on the flange near where they mount to the intake. Probably 3 numbers over 2. For example:

450
20

You should be able to seen them from above carbs. And if yours are like mine, you'll probably have to keep a cleaning brush handy to clean the surface in order to read the number. Hope this helps