Here's a pic of the cowl area. Rusted all along the lower seam with the firewall, and several big rust holes where water probebly stayed under the lower windshield moulding :

I found two screws I can't identify, on the firewall, on the driver side, they were there when I took the car apart, they didn't hold anything, just went through the firewall. the other side is in the left fenderwell. Does anyone know what they are for?
Inside :

Outside :