I picked up the two spark plugs today at the parts store. I gapped them to .044 and installed. I also removed and gapped the other six plugs to .044.
I noticed that the spark plug tips of all plugs was a white/grey color, which means the carb is set too lean. So I adjusted the idle mixture a little bit more rich. I'll monitor that over the next two days of driving and if need be, I'll go up on one size in jet size(stock for 0-1850S is 66).
I checked the MSD website for factory setup for an 8479 distributor. The default advance springs are supposed to be two heavy silver springs and a blue advance bushing. What I found was that two light blue advance springs were installed. I removed them and installed two heavy silver springs. I will see how the engine runs over the next couple of days
