There are a few different changes made to an FJ60 over the 6-7 years they them. In 87' they turned into a FJ62 which basically said they had the newer 3F engine, newer ones were fuel injected. They also would have had an automatic tranny. FJ62's also had the turned front end that allows for a springover with out as much need for a knuckle rotation, the front axle also would be trussed much like an 85' mini front end.
As for the changes in the FJ60, pretty much none mechanically. In 84 the transmission changed to h42 w/extension housing rather than a H42 without an extension housing. if you find one with the extension housing, it will make it a direct 5 speed swap if you want to. Also drivelines changed a bit with the longer tranny. Preferably you will want one with the cv style front driveline. These are great drivelines (I run them front and rear on my 40). They can extend at better angles than the mini-cv's and hold up really well.
Another plus is AC, not all 60's had them as I recall, but they will all have power steering.
PM if you need any more info...