I am guessing it has to be keel stepped or the mast would simply have gone forward perhaps damaging the step itself and the attachment point but not the deck in front of it. Assuming it is keel stepped I can't imagine any major structural damage that would justify the cost of professional inspection unless you intend to have someone else fix it. I would worry about the damage allowing water intrusion if it is a cored deck and getting the bow out so the door will function properly. If it is cored it's possible the cored material was compressed forcing the top and bottom laminates to bow out. This could create the situation you describe. Some pictures would be helpful and no doubt someone here knows exactly how it was constructed which would help in diagnosing what has happened.
1976 Chrysler 22 "CinJam"