Just went thru the 3 pages of posts and read them.I've had 2 Hughes converters that were 32-3500.BOTH stalled at 2200 like yours. MY 60' were 2.18 - 2.26.Odd.. The car was dead until the engine hit 3000 or more. Changed converter to a Continental 5000 8+. Now I hold it on the line at 3200 and have 1.70-1.80's 60'.My 67 Dart is low Horsepower,around 240 ish to the rear wheels. I don't drive it on the street.My guess is the converter is holding you back. Just a thought.