Slight miss in my 69 Z28

[sixt9rsx33]

Ok guys I need someone a lot smarter than me to help me figure this out. This morning I went and checked the dwell since I had not done that yet. The reading was 85*!!! I could not even believe the car was running. I adjusted down to 30* and during the adjustment I saw a spark on the end of the screwdriver when I was adjusting the dwell. Don't recall ever getting a spark off an allen wrench or screwdriver while adjusting dwell? Anyway set the timing and dwell, car is just purring at 900 rpm with 12* static. I expect something is still wrong with the ground in the distributor but could that "spark" have been a discharged build up of unwanted voltage?