Is there any play in your distributor? I had one of those cheap TSP distributors (MSD copy). The end of the shaft fit poorly into the distributor gear and there was about 20 degrees of play in the distributor rotor. Wound up buying the MSD distributor.
There is a little, my best guess would be between 3-5 degrees. Not terrible. No shaft play in the distributor off the car, it just slop where the end of the shaft fits into the gear same as yours.
