I added door grommets on my 73 and 77 Nova for door locks and security wiring and it wasn't too bad to do.
I took the door panels off and on the inside of the door between the hinges there was an added inner structure to give more support to the door and in the middle of it there was a hole about 2-3" in diameter punched out and I could see the outer skin of the door (this hole I'm thinking was there on the car so they had only one inner structure for the door and it would allow for adding the hole later if the car was to be equipped with door locks or power windows or not).
I also noticed a small dimpled in the spot. I then looked in the side of the cowl to see what obstructions were in there close to the same level as the dimple on the door so the grommet would be level when the door was open between the door itself and the side of the cowl. I then marked both the door and the cowl with marks to know where to drill.
I then bought some door grommets (the accordian looking flexible rubber tubes) and found out what size hole they required in the door and side of the cowl. If you get a pair of grommets, get them in a larger diameter than you need to allow for future wires that could be run through the same grommet later.
On mine, I knocked out the hinge pins and removed the doors to drill the correct sized hole in the door and also the side of the cowl (it may be possible to drill the holes out with the doors on the car but depends on what obstructions you may run into).
After I deburred the holes, I painted the steel edges with paint to prevent future rusting.
I then put the doors back on, put in the door grommets and ran the wiring from the interior and into the doors through the grommets.
Also tie up the wiring so it doesn't get caught on anything.
This pic is on e-bay. You can see the raised area with the three dimples marking the location of the center hole and the two screw locations. It is a 70 but your 69 is the same. To make the holes I used electrical knock out punches. I used a hole saw for the first and didn't like the ragged edges, the knockout punch leaves a clean straight cut hole for a tight fit of the rubber duct.
You will see a dimple marking the hole center on the door, no screws were used on the door end of the factory duct.
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