Putting oil down the bores should not be causing any problems, even if you did over do it by taking out the plugs and spinning it over the excess would just pump out. The fact that it wont turn anti clock or clockwise means there is something jammed up. It might not even be related to the engine, there could be a stray bolt jammed between the ring gear and the bell housing (have seen that before>. Before tearing down the motor just check out the obvious. You could check for a dropped valve from inside the rocker cover, look for a massive clearance between the cam and followers.
Bob
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