All the information that you need to know really is posted here in this thread. The cautions are here. The cautions are explained about the materials.
Looking at the bushings and bearings readily available no one is specifying magnetic or non-magnetic. You will need to ask that before you buy.
I do know that in addition to the oilite variations out there, there was also a solid bronze bushing at one time. It was also non-magnetic but contained no lubricants.
I personally would add that the pilot roller bearings in my experience are not what you want to use. They have no advantages and present some additional potential issues.
The simplest way to deal now with the controversy is to use an OEM Ford. You have to do your homework and actually search for one, like maybe call one of the Pantera parts vendors? Sometimes it appears that all of "us" take too much for granted and expect everything to just fall in out lap like ordering a Big Mac and having it delivered?
There is a D0AZ-7600-A Ford bushing that is also out there. It superseded the C8. The way Ford Service Parts works, it should also be essentially the same but I don't know that as a fact and what is different if anything, about it?
In reality, this isn't all that complicated but there are a bunch of novices here that need some very simple things explained to them. Some of us are trying.