Here’s a 1980 targa I converted using a mid year roof. Had many of the same issues/ concerns as Macon. I used titanium rods inside the A pillars with 3m structural adhesive along with welding. A roll bar at the least I would recommend. I hung an electric winch from the ceiling and used ratchet straps to lower and raise roof about 300 times. Glad I did it came out better than expected, a few what the hell did I get myself into moments but eventually it all worked out. I wouldn’t do it to a nice blue chip car.
