The puddle would have formed between the edge of the manifold and cylinder head then as well rather then only spilling over. Put some good teflon tape on your bolts; my car did the exact same thing before I did.
Look how wet it is right in that corner right above the hole.
It would just stop there suddenly without puddling in that corner and that little hole wouldn't have that much puddled at all if it came from the bolt, so that was my reasoning on that.
Of course do the bolt threads, but the cover is obviously leaking also.
