I seem to recall later radians has the stator moved to a different location, something to do with Honda trademark i think.
I think you might be right. I think the alternator ended back on the end of the crank. That shouldn't matter.
the fj has 2mm larger carbs than the FZ, but the carbs will fit (just barely - frame rails are closer together on the FZ ) on the FZ with individual pods. These larger carbs will add 5hp properly tuned/jetted. You will need the intake manifolds from an FJ, they will bolt on the engine straight up. and +1 on using fj cams for most power.