3 on the tree to the floor

I'm considering a clean /6 3 speed 66 Barracuda for something fun to drive.
How hard would it be to convert the column shift to a floor shift?
What coulmns will work, and what ones won't?
I'm pretty sure a floor shift "hump" is easy to find (buy new), as well as a shifter.
(although a few shifter pointers might be appreciated).
I think I know where some 63-64 A bodies are for parts.
I also think the columns changed in 67 due to safety laws.
Thanks much.