Slant dies when put in gear.

Didn't want to start another thread on the same topic.bttt
I've been dealing with the same problem on my /6. I did the full tune up.Points,condenser, cap,rotor,plugs,plug wires,and air filter.The carb and gas filter has been replaced.The engine has gotten way better,but once in a while it likes to jolt around in the engine bay like a looney in a strait jacket while it's in gear.
Yesterday I went at it again to tune the ride.I popped off the cap and rotor so I can readjust the points. This time I noticed when I was turning the cam back and forth I noticed that it has allot of wobble on the distributor shaft. Is that normal? Plus the vacuum advance is wasted too.

Frank