When I replaced my engine (CO200) I considered many different options for shoe horning the engine into the same spot as the Farryman. All of these required changing the rear mounts in some way. The engine dealer convinced my that I should mount the new engine with the mounts as designed. They told me that changing the mounts could interfere with the vibration damping, which is probably true. It seemed I would need a custom exhaust elbow also. So I chose to move the engine forward a few (four???) inches. I don't regret this, as it opened up more space around the engine.
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