I have the steering wheel off and the steering box unbolted from the frame. The column is unbolted from the dash. Is there anything else holding them together? The shaft will not budge from the column.
I'm assuming this is a '66? The rubber bushing at the end of the column tube which stuck on the end of the steering box can be really stuck on.
One of my '65's was really stuck on since the mixture of age, grease, heat, and brake fluid literally melted the bushing onto the steel. I had to really pull on the tube with all my miniscue strength to pull the column off the steering box.
Have you tried rotating the column around the steering box? Use your hands only, anything else, like a chain wrench will really mess up the tube.