A little progress. Warmer today in DC metro. Had to drill out allen center of bung and then use metal jigsaw blade to cut it out. Got it out finally with minimal damage to threads and got sensor installed. Max vacuum idle tune of carb has about 13.9 reading, which seems fine. Issue will be when I drive it. Too much melt and salt on roads now. Also cut out a little of carpet as it seemed that I was missing about 1/2 inch of travel on throttle that could not be adjusted on carb side. The pedal was not throwing far enough. Maybe that little bit will make a difference. I will update when I can drive it. I will rig my video camera to look at tach and A/F..