1968 350 2V. Yesterday I set timing, idle fuel mixture and idle speed (895 in Park and 640 in Drive). There is still a slight miss in the left bank at idle. I pulled the plugs on that side and they looked good, nice and tan. I checked the ignition wires for good connection at both ends. There is no stumble or hesitation under any throttle position at any speed. The car runs and pulls well. Any ideas what could be causing the slight misfire? The only thing I can think of is a bad wire. TIA!