Last time I washed my 67 I got water on the passenger side floor. The heater box isn't attached the way it should be and I was able to get my hand up into the cowel through the vent on the passenger side. I think the water is from a clogged drain in the cowel. Some leaves came out so I think that's what is clogging it. Can someone tell me where it is in the cowel or where the other end of the drain is so I can try to unplug it? THANKS.