Wiper seals

Ok guys....this is related to the thread so hopefully someone can shine some light on this for me....

72 plymouth duster

carpet was wet, ripped it out during resto, I have noticed since...while sitting outside, after it rains. I have a puddle of water on both the driver and passenger side floor boars and appears to be coming from under the dash some where, windows are up and are sealing tight agains the seals, the floors have been painted and a layer of dust has settled on top of the paint and I can see where water droplets washed away the dust and it looks like its dripping from the dash but I cannot see where water would be coming in at???

is this the wiper seals you speak of maybe giving me this problem? and if so, how does it make its way inside and how do I check to make sure thats the problem?

could it be driping in passed my windshield gasket some how or something? or is there other places I should be looking?

thanks in advance for the help guys