Water dripping through firewall behind the dash

Oldmanmopar said

Here is where they rust through the cowl. There is no paint under there. So spraying Cavity wax in the cowl on all Mopars is a good idea.

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Great pictures, definitely shows the spot they rust out in the lower cowl.

Pretty sure on a '73 AC car though there isn't a cowl vent on the driver's side, it'll just be a flat section of sheet metal. The passenger side will be the same though.