There seems to be moisture getting into the area above the distributor next to the ignition coil and below the cap and rotor.

I notice there was a hole, as pictured below:

Name: dist-toyota.jpg Views: 1805 Size: 58.6 KB

Is this some kind of ventilation hole? I know how important it is to have a tight seal on your rotor cap, but if there is a hole directly below it, it seems to defeat that as moisture get's in there.