Dad, Good test ride. Had to stop short on the first pull, secondary carb was coming in too soon and she went flat before picking up speed. Tweaked it and went out for a number of pulls starting variously from 20 mph to 40 mph. Officially, the motor came to life! Lots of power in there and much of the vibration is gone now that the throttles are opening more fully. Transmission kicks down properly for passing gear and later firmly shifts back to hi range. Video below is the first pull from 20 mph. No where near as hard as the pulls that followed but you get the idea. I made several other pulls, final one ended at 90 mph. She was still pulling hard at that speed and we were below 4000 rpm but I was running out of straight road! Smile dad, Ol Bessy is now in the daily driving rotation. That Chevy Motor you always wanted for her is a great choice. It'll run rings around the flathead we had in her.