Running out of things to do at the moment so I decided to tackle the annoying unused and incorrect mounting hole in the top of the radiator shroud that comes standard when you buy the new/repro GM shroud.
Here's the before shot:
What I ended up doing was getting a 1/2" hole saw and boring out a 1/2" plug from the burned/melted original shroud that I've had hanging in the garage:
I then carefully filed the edges of the plug with a flat file and used a small rat tail file to file the hole in the new shroud. When I was satisfied with the fit of the plug, I placed a piece of tape on the underside of the hole and filled it with 5 minute sandable epoxy. I then pushed the plug into place. After it sat overnight I used my mini-mouse sander with some 240 grit and made the excess epoxy disapear. A few mist coats of SEM Laundau Black (my new favorite paint) and the repair is invisible.