I replaced my points with a Hot Spark setup and was amazed at the difference it made. I had enough wear in my distributor shaft, that the timing was not steady. The hall effect sensor and magnetic pickup are a little less sensitive to wear.

Also make sure that your mechanical advance is working properly.

One of the next things I want to install is a 123 ignition that completely replaces the distributor. You can change advance curves and it can modify the spark timing between cylinders to balance them out.