Jay - possibly some additional clarification might be in order.
"Pouring out the bottom of the float bowl"
Does this occur when the engine is running? Does it not occur when running, but when the engine is shut off?
Is it possible that the fuel is NOT coming from the float bowl, but from the cast iron throttle body where the throttle shaft extends from the throttle body?
I am having a difficult time visualizing how fuel can come out the bottom of the fuel bowl. My first thought was the fuel level in the bowl was too high, and fuel was exiting through the pump operating rod slot, but the top of the slot is higher than the air horn / bowl seam; so fuel would be exiting there before going through the slot.
And no offense meant by the next comment, just trying to make certain everyone is on the same page with semantics:
Air horn - top casting made of zinc alloy, a.k.a. pot metal (contains choke)
Bowl - center casting also made of zinc alloy
Throttle body - lower casting (cast iron, and contains throttle shaft)
Jon.
