the 86 ifs hub is an interesting mention. I have NO idea what compatibility would be like for the solid axles, but its the only IFS year that didn't have the front end locked in all the time with solid flanges. If you want an automatic, and IFS- '86 is the year to look for.
i think the whole point of doing these upgrades is to end up with the wider, vented rotor?? In my opinion- stay away from the the FJ40 part numbers. some of the early FJ40 and FJ55 front discs are different, and expensive to find new calipers and backing plates, rotors... etc. although, i believe the last FJ55 of mine had those rotors that go over the wheel studs from the outside, and attach to the face of the hub with a couple big countersunk screws. no pressing wheel studs to get the rotors off, so they are much easier to work on, but the parts were 3 times the cost.
The Fj60 stuff was much less expensive last time i was doing Toyota stuff. the hubs and stub axles/birfields may be interchangeable with the minitruck stuff... cant remember. i would gravitate towards the fj60/62 stuff.