The 240 Yanmar is an excellent motor for a 23.
My bigger concern would the the engineering needed to install a straight-drive inboard in a board origianally made for an I/O. The easy fix is filling the hole from the Bravo3. The harder issues are engine install under the console, mounting transmission, installing the exhaust with a surge tube and 12" of riser elevation (lots of guys, including some here on CSC do not properly install an exhaust .... the consequences of their oversight can be significant), installing the rudder and hydraulic lines.
Lots of work and I'm not ceratin that the benefits of a straight drive inboard are worth the costs/effort/time over the performance seen with a 4stroke outboard.
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The Idiot Who Re-Built the Burnt-Up 35 Duffy
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