I appreciate all you guys. I went ahead and did the modification myself. They are hardened steel weights for sure. I bought a cobalt bit to drill through each flyweight. But the bit wouldnt even touch them. Used plenty of cutting oil and tried various speeds and slight force. This was with my brushless Milwaukee m18 drill. I ended up using a dremel with a tapered green stone to do most of the rough cutting. I needed to enlarge the hole in the flyweight from .189 to .250. The dremel had no problem doing the work. I finished with a good chainsaw round file and deburred the holes with a very sharp brand new tapered reamer. The plastic bushings went right in and on the pivots of the distributor no problem. One was slightly dragging so I reamed it with a small sharp drill bit by hand. No more slop, weights snap back when the rotor is realased. And now my timing is rock solid. At least until the plastic bushings wear away. I did sand the pivots with some 600 and 1500 Emery cloth to smooth them out. Everything cleaned with electronic cleaner. I then wiped the weights down with a rag that had wd40 on it. Seemed to work just fine. I'm gonna pop the cap and rotor back off today and check how everything is looking and moving. Maintenance day today. Clean up distributor, clean up the carb, re seal 2 intake manifold bolts that are weeping oil, break out the vacuum gauge and timing light and dial in both the carb and the distributor. Wish me luck and hope that I dont find any other things that will make this take any longer than it should.