I would pull the neck and get a proper evaluation of the pocket and that crack.First checking that the 4 bolts are tight.A gap there is not ok. You want the neck seated firmly in the pocket, and need to confirm if the body is ok.(it looks like it is broken). Take some pics and put em up. Also , maybe post it in the luthiers forums.Lots of experience and very helpful folks there.Good luck bro.
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