I got looking close at your photo, it looks like the raised feature lines at the rusted area (near windsheild) look like it might be from truck aprox 1937 chev truck. (just a guess)
the car pic that I just posted under "need help to identify"has the same vent hole in the cowl. Don't know what mine is yet, but it looks the same on top.
Found this car in the bush at my grandfathers farm, he is no longer with us, can anyone tell what they might be? Thanks Curious_george PS.there is a vent in the cowl under the snow Pic attached....this time.