I could not budge it with my hands...I will go try a screwdriver, but it feels pretty stuck. Treeroot said it was running when it was in the FJ60...maybe he has more info.
More than likely you have some rust on the rings/cylinders. It's probably not much. I would squirt some PB blaster or even a cap full of ATF in the spark plug holes and let that sit for a day or two. Then try to turn it and feel for roughness. Even if it has been sealed from the elements the surface rust on the shiny bare cylinders is common. When a running engine sits for a long time the oil on the cylinders disappears and the moisture in the air will attack. Is rarely done but any engine that has been run should get a couple squirts of oil in all cylinders if it's gonna sit for a long time!