this was briefly covered a few days back but I'll ask here anyways.....
will shafts and bearings from a 2001 tj dana 30 front bolt right into a 1989 XJ vacu disco front?

no

depending on your definition of "bolt right into". I assume that means no custom work of any kind (i.e seals)

so what all would have to be done?

I think you need an tube seal for the long side installed just behind the carier bearing.

the wheel bearings changed mid 91, when they got rid of the disconnect in a xj.

carier bearings should work tho, R&P will not.