If you cannot get the original Italian stuff, the owners manual calls out precisely the use of "MOBILEGREASE SPECIAL" for the front bearings and steering rack...Another fine substitute is whatever you have (!).
So whatever cool stuff PepBoys is selling for wheel bearings, just make sure the heim is cleaned of all old tarnish and then spend some Spa time working the new grease around the joint. I think there is really no point in overpacking inside the boot, work enough to cover the bearing and avoid a grease aquarium.
Getting the boots over the heims is super simple. Finish by inserting the alignment spaces and voila, good for another 50 years.