I doubt there weren't originally holes in the cowl. Like I said, they were probably filled at some point in the truck's life. Peek under the dash and you'll see the holes in the brace there. Here's a picture.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.