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From everything I read & folks I asked, there's a very good chance you'll have to split the case to extract the head stud as high heat is required; particularly if the stud is broken.
Before you do anything, I'd do a leak down to see the health of the top end. And after you opened up the top end, I'd at least check the valve guides, condition of cam & rockers.
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87 930 K27HFS/B&B/Twin-Plug... Megasquirted 
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