I have only ever seen a plastic "bushing"...
Never a bearing...but my 70 is power steering...
I recently had to build a column for the Duster that we switched from power steering to manual...The bottom half of both steering shafts were identical...The top half of the PS column was shorter.
I'd imagine that also applies to B Bodies...heck they may all be the same for that matter...
The splined couplers are different but the shaft itself was the same...At least on an A Body...

The pic is not great but it shows how far my column sticks out past the firewall and rough length of the exposed tube...