Good luck! I am rather new to I/Os but I know I was warned about having sufficient height of the elbow in the riser in my 25. My local shop suggests a new flapper in the y pipe, too.
The extension to the riser is not that pricey for a raw water engine. They are a bit dear for a FWC engine.
Not sure if it is as big a deal on the 23 as the 25 as the engine likely isn't as low in the water.
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