Interesting. I did change the condenser when I changed and reset the points.
Based on the above, I think I'm going to (in this order):
1). Check function of heat riser, free up if stuck
2). See if I can lean out the carb a little more
3). Check/replace throttle return spring
4). Replace accelerator pump, in case it has a leak
5). Check/adjust valves
Again, many thanks for the advice.
