See that clamp & bolt right there on the shaft by the spark plug wire? It's at the base of the column body, but only encompasses the shaft.
After you remove the lower bolt at the box, if this clamp is loose your shaft should slide right up into the column without having to loosen or remove the interior or firewall bolts.
In theory anyway...
Some EB columns had a second snap-ring that might keep your shaft from rising up, but I'm pretty sure that those were on the later columns. Your early should just slide right on up.
Paul