I think what Rhinoman said is still valid, especially since you said the pulley was loose. Remove the pulley altogether, and check the key on the nose of the crank, even though it might now feel tight to the touch, if the keyway is screwed, the pulley may have rotated on the crank and thrown your timing out.
Going off the markings at that point is useless.
If it is the case, and slips any more, best case your motor won't run, worst case, it won't run again...ever. Get it checked.
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