Steering columns on our 1st Gens are the easiest to work on, in my experience.
Yes, to get the firewall rubber seal on properly, the column comes out.
As was mentioned, the assembly manual is a must buy.
Now then, you have a couple bolts under the hood, the screws that hold the metal "seal" around the shaft at the firewall, and (on my '67) three bolts under the dash that support the column.
Undo them in this order, and column will pull right out very easily.
I've done it numerous timewhen I needed under dash clearance while working on things.
Just make sure you torque the bolts properly so that when you turn left, the car goes left
[This message has been edited by 67LT1 (edited 06-08-2001).]