This is so easy to fix;
The problem is that stinking wire clip. All I did was drill and tap the end of the driveshaft for a small Allen-head screw and fabricate a lil spacer to keep the Allen-screw from binding it all up. Now I can swap distributor cams in a heartbeat. Yeah I still have to remove the base-plate, but hey the distributor was only 30years old when I installed it in 1999, and was free.