Regarding my post #2 above, I just did some research. I could have sworn I'd read someplace that Toyota Clutches should not be resurfaced, always replaced, but cannot find that anywhere. What I found were tons and tons of threads, on various Toyota forums, in which it is clearly stated to have a flywheel resurfaced while the clutch is out if there is any sign of bluing or uneven surface. If the surface looks 'like new', then go after it with a scotch bright pad to remove any minor glazing, and then clean the surface until it is totally clean.
Resurfacing a flywheel costs something like $40 ~ 80 by a good machine shop, so that sounds like pretty reasonable insurance.
A new flywheel from Toyota is $350~400, so going to that, if the machine shop says they can resurface the old one, is perhaps only for those who are in for the "lifetime" award. Rock Auto sells off brand flywheels for $90~200 ("...you takes your chances").
Note that some Toyota flywheels have a step which must be maintained when being resurfaced (not sure if that applies to the FJ though). A good machine shop should know how to deal with that if it is the case.
When fitting a flywheel, whether resurfaced or new, clean the surface until the rag comes back totally clean.