Lower control arm shaft & bushings

Ok I found a guy that had a set of NOS lower control arm shafts with the bushing complete for a 64-65 A-body . These are in the lower arm assembly.

My question is this. I have everything completely out of the car, torsion bars, strut rods etc. And the lower arm is out of the car. What is the best way to get the old spindle shaft out of the lower arm. Should I just press them out or is there a trick to it?

2nd do any of you guys ever replace these bushing or is the best way with a new spindle. it appears the bushing is made onto this spindle and not replaceable?

Here is a picture of the parts.

Thanks!