Locked Mechanical Timing

Sorry for the hijack. By the way, factory single point distributors have NEVER been "hi performance." They all suffered from spark scatter, and the vacuum advance changed dwell dramatically. You used to be able to buy (Dealer) a bushing kit from them, but they required a reamer/ burnisher much like the intermediate shaft bushings, to use them. Even "back in the day" I experimented with Accel and scored a hemi tach drive (for 440) that has a top ball bearing. And, at some point, I scored a Corvette breakerless (forerunner to HEI, small cap) and MODIFIED that to fit a small block. Unfortunately the machinist was AFU. A member on here bought that from me, I don't remember who

In other words, I'd "do something different" unless you are absolutely interested in "restore correct". One easy way "out" of single points is Pertronix