Are you sure it's not an O-200 case with adapters for the conical mounts? They exist, and have been used to facilitate installation of the O-200 on mounts designed for conical bushings.
http://www.continentaladapter.com/
Continental 0200 engine mounts
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- Name: John C
- Location: KLCI, NH
- Aircraft Type: 1946 C140/C90
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