Stamped, the cast (raised) numbers are meaningless (well, at least for identification).
EDIT: more time to further explain. The raised numbers (and often letters) found on carburetor castings are referred to by enthusiasts as "casting numbers". The numbers were used internally by the carburetor companies as a number for a "casting blank". A casting would be made with certain physical characteristics (called a casting blank BEFORE machining), but then this casting could be machined a number of different ways to use for different applications. Sometimes these differences are quite obvious (will give some examples) but often the differences might be the width of the idle transfer slot, or the diameter of the idle air bleed.
For obvious examples, consider the throttle bodies used by Oldsmobile and Pontiac 2-barrel carburetors in 1957:
(1) Olds J-2 front carb - not machined for idle screws, 1/8 inch pipe tap on rear of casting
(2) Olds J-2 rear carb - not machined for idle screws, 1/4 inch pipe tap on rear of casting
(3) Olds J-2 center carb - machined for idle screws, 1/8 inch pipe tap on rear of casting
(4) Carb from Olds with single 2-barrel, machined for idle screws, 1/4 inch tap on rear of casting
(5) Pontiac tri-power rear carb - not machined for idle screws, and no vacuum tap on rear of casting
Using casting numbers only to interchange parts is often an exercise in futility! Unfortunately, many try this, and then sell the result cheaply on ebay because they couldn't make it work!
Jon.
