I pulled the #4 plug and it was clean. I assumed it was fouled like it had been in the past. At that time I was running 165 mains and now I'm running 155's. I saw the fire from the exhaust pipe and assumed rich. Today I turned the mixture screws out a full turn, (It was at 5/8's) and the popping went away and the car drove a little better but at idle it was way rich. What about going to a 70 idle jet from the current 65 and turning the mix screws back to 3/4? The holder is a 100. I feels like it ran better with more fuel in the circuit. What do you think? You can hear the mains come in and it runs great over 3000 rpms.
I did switch the carbs around and now it seems to run better. I can't tell you why but it does. There was some
oil on the intake valve just sort of puddled up in there like it had leaked past a seal on #4 but the plugs look good. There was enough to stick a screw driver down in it and pull out a drop.
You guys are probably right and it is likely the carbs. The LM1 A/F seems to think I need more fuel it the transition.