It's possible that you have spun a bearing. On the full pressure 235, they are all two piece, insert style bearings, both mains and rods. Since you have the oil pan off, it's fairly easy to check. I would check the mains first, one at a time. Be sure to torque them when you put them back together. Rod bearings can spin, too, so they need checked.
If you have the pre-54 235, splash oiler, the rod bearings are poured babbit, which deform easier than the insert style. It is possible to have one egged out enough for the rod to be stuck so the engine will not rotate. I had that happen on a 216. Engine turned over after the rod caps were loosened.
