You'll have unused holes in the firewall anyway. I have a '38 coupe & believe the truck and car firewalls were similar if not identical. It might be easier if you post pics of the areas that concern you. I or someone else can then take a pic of that area and send it to you. I have a few pics that show parts of the firewall but I haven't taken pics with showing that area specifically.

I did find this one that may be of assistance.


Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.