Looking to see what years might be interchangable, found one with your same problem.
http://madison.craigslist.org/boa/824271693.html
1992 Mercury 200 hp Outboard EFI
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Date: 2008-09-02, 4:44PM CDT
1992 Mercury 200 hp Outboard EFI, blown powerhead. Engine not seized but there is a hole in the block behind the starter. Great lower unit/ trim tilt etc. $1000 608-332-6110