Bilge Water Forward

[bigeasy1]

Not sure if this helps but I had a similar problem with my 1974 Tsunami.In my case it was globs of Potter putty that basically blocked up the area of the fuel tank forward of the I/O motor box.
The putty was so thick under the tank platform that it prevented any water from getting to the transom drain.

I had to use a small crow bar hitting it with a 3lb hand held drilling (sledge) to break up the putty.I have to say that it was some damm tough putty..Ground up the rest with a combination of #24 grit fiber backed discs on my disk grinder, and a bunch of long shank drill bits.I glued in some pvc drain tubes on each side of the keel under the new tank platform.
Water drains nice and quick now.