Randy, For what it's worth:
I have had both rear axles apart as recently as 2 weeks ago.
I cleaned them up and and replaced the grease with moly.
Both axles looked good and this IS the Crypt Car we of which
we are speaking. I don't know if a grease fitting is worth
the effort.
And yes, I have also replaced all the u-joints.
You should do this also as a matter of probably needed
long term maintenance. Excellent point, to remove the
needle bearings, totally clean off the white shipping
grease and repack with moly.
I hope this helps you a bit.
d