Spent the afternoon tuning. I changed the plugs from the black soot-covered Autolites, to a set of NGKs. I set the dwell to 30 degrees and the timing to factory spec of 10 degrees BTDC with the vacuum advance disconnected and plugged
I had a nice pleasant time setting the idle mixture the old-fashioned way with a vacuum gauge and the low rpm range tach on the Sun machine.
I pulled and plugged the vacuum lines, unscrewed the mixture screws out 2-1/2 turns (that was actually the existing setting on the carb) and set the idle to 850 rpm. I checked the vacuum reading - it was about 17 inches. After turning in the screws a half turn at a time trying to get the highest vacuum reading (and readjusting the idle speed back to 850 after each sequence) I finally got to 21 inches of vacuum before the lean stumble would appear. That ended up being about 1-1/4 turns out on each. It really made a difference in the eye-burning atmosphere in the garage. She starts right up at the first turn of the key now.
