3HP Reliance Motor, drive end bearing / housing / gearbox change

Any previous threads, pictures, or experiences out there pulling the drive end motor housing and swapping the bearing and or housing. I'm fitting a back gear drive box from one 3HP reliance motor to another. The gearbox is custom pinned to the end frame of the motor and I'm struggling with a procedure to properly align and re-pin the gearbox to the new motor. Not much to work with regarding alignment and re-pinning and I know it needs to be close for the direct drive clutch to align and engage and work properly without vibration.....thinking a few thou would be good.

So with that struggle I thought I'd exchange the entire motor drive end bell/housing that the gearbox was originally mounted from. So looks pretty straight forward except for how to get the end bell housing off the armature shaft as there is not much to work with regarding a puller or other means to push / press/ tap the bearing / housing off the shaft.
thoughts?

thanks
Brian