It's been a long time since I have had my hands in one. IIRC on the bottom of the bowl there are two smaller bakelite pieces glued to it to form a kind of V shape in one of the fuel passages. Those are bad to leak over time. When I was working on them we put something like JB Weld around those seams and also put a foam part from a Q-Jet in between the bottom of those V's and the base casting to keep upward pressure on the seam.

If those seams are leaky they would allow fuel to pour into the throttle bores between the bowl and the base casting.