I know for sure that a 63 has a solid column box combo, but the 64 MAY have a rag joint. If it does then it's simple. Unbolt it...
If not, you're in for a ride...
Directions:
1. Disconnect Horn wire and turn signal wires under instrument panel. With Auto trans, also disconnect neutral switch wires.
2. Remove steering wheel.
3. Remove steering column clamp.
4. Pull rubber seal up on steering column and move dash panel insulation out of the way.
5. Remove steering column cover plates.
6. Slide steering column from steering gear through opening in dash panel.
7. Remove exhaust pipe from manifold if necessary to obtain clearance.
8. Remove pitman arm with a suitable tool like a pitman arm puller.
9. Remove steering gear retaining bolts.
10. Lower car and disconnect wires from left bank spark plugs to prevent accidental damage to them.
11. disconnect shift rods from transmission levers.
12. Remove brake booster if necessary.
13. Lift steering gear assembly from engine compartment.
14. Reverse procedure to install.
That's about it...
Good luck!
FE