73' B3 340 Duster pro touring build

Checkin out your build for the first time, kudos to you for some awesome fab work:hello1:, I wish I had half the skills you have!

On a separate note, I would like to close up a bunch of the a bunch of the holes in my firewall and inner fenders but I'm not sure which ones I need to close and which ones should stay open. how did you determine which holes in your firewall to weld shut and which ones to keep open? I don't want to have to discover I needed a hole I welded shut later in my build:yawinkle: