Where does the top vent drain?

[John Middlesworth <jape@email.unc.edu>]

I have a leak in my 72 MGB that I'm trying to track down.  I poured a cup
of water into the air vent just in back of the hood.  It didn't drip
inside and it didn't end up underneath the car.  Instead, I found it
pooled up behind a brace that sits on top of the transmission tunnel.
More than a cup of water would have clearly landed on the floor.
So what can I do to restore proper drainage to this vent?

John Middlesworth