Water leak inside 65 barracuda

My 65 barracuda gets a bucket of water in the front floorboard (both sides) when it rains. I think it's coming in through the cowl and in around the air vents. Anyone out there fixed a similar problem or got any ideas or just some sympathy for me? I've had plug holes drilled under the hood to clean out the dirt and had some stop leak junk poured all in there too. Still no luck.