Thanks all. Oldksool-those were the types of videos I saw, and consistent with everything I was reading, leading me to expect to see these on my driveshaft. I didn’t see those holes on the sides of my driveshaft “ears†but it appeared I had some sort of plug at the very tups of them. Turns out I didn’t. It was just the shape of the metal. Not sure why they put little circular dots at the ends. So to close the loop on this, I cleaned things really well and found out there are no holes at all on my driveshaft. Curious as I thought all 67 FBs had that GM style set of holes. Maybe my driveshaft was replaced at some point. Turns out the clips were on the inside and covered with grime, adding to the impression I had the nylon internal clips since there were none on the outside of the u joints. Thanks all. Problem solved. Continuously learning...