Pressure regulator?

If the carb flooded due to debris under the n/seat [ or excessively high ] fuel pressure, fuel will drip from the booster nozzles.

If fuel level rises because the pressure is higher, but not high enough to overcome the n/seats, then you will not see that unless the float level was misadjusted initially & the fuel level was already high in the bowl. Hope that makes sense!

All of the Carter 4 bl carbs have a very high leverage ratio of the float against the n/seat & are therefore less susceptible/prone to flooding than other brands...