water leaking inside passenger floor?

[gmachinz]

So after taking apart the AC firewall box to reseal it, I think I discovered how the water was getting in-there is a seam/lip just above the blower motor where water trickles down from the hinge area and rests/collects under the heater core hoses. When I took the AC enclosure off, I noticed the foam gasket that seals the inlet/outlets on the heater core had not only "shrunk", but there was a gap allowing water to get into the cab area. I am wondering if this was the water issue that would trickle inside from time to time? The area was damp and kinda dirty-grimey too. I did find a good foam seal at the boneyard and I siliconed it around the heater core slightly also just to make sure. Anybody else have that kind of issue? I should mention the entire seal around the enclosure was suspect also.....dryrotted and cracked.
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