You can check with Bobby Brown at Blue Water Survey. He is very honest and will tell you what he does and does not know. He works out of Florida and Texas. He is very knowledgeable of both sail and motor and is often recommended by PAE (Build the Nordhavn). I know him personally and would give him a great reccomendation. His number is: 214-522-3505. Just tell him Brian sent you to him. That way he will charge you double!!!
Hope that helps.
PS I like the old Gulfstars. Nice roomy boats.