Depends why it won't turn over. If like TT says the valves have hit the pistons you could be looking at a head rebuild. It must be pretty stuck if you can undo the crank bolt when trying to turn it anti clockwise, using I assume only a ratchet.
Was the timing correct when you put the head back on after you had your 'big leak'?
I would say your only option now is to drain any coolant out of the engine, and take the head off again. If you can turn the engine over by hand with the head off, you know that the problem is with the head / timing. If it won't turn over even with the head off, the bottom end has seized up for some reason.
You need to be careful and methodical when rebuilding the engine and getting it to start, as you could soon end up with a big engine shaped paper weight!!
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