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Renegade Engine upgrade

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Jun 1, 2008
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I am looking at a Murphy Renegade that has a Rotax 532 which is shot.
The entire plane needs to me re-sone and re covered..A genuine project.
I would like to install a 4 cyl Rotax 80 hP engine. M
My question is... was there any upgrading done to the basic fusealage in order to make it stronger to use the 80-100 HP Rotax engine ? Or to accept the engine mount required for the 4 Cyl.
If so... Is it a major operation to change the engine/

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