"if you repowerded your boat , must you change your gearbox too or a adaptation is possible ?"
IF the HP and RPM of the new engine are similar to the old one , and the tranny is in excellent condition , a change is not required.
Most engines will fit up to a standard SAE bellhousing.
They come in sizes 1 (big HP ) to 5 , lawn implement size.
The marine tranny folks use the SAE standards so fitting an engine to your old tranny should be possible.
I would contemplate upgrading to a better tranny like a Twin Disc , which can be had used rebuilt for modest bucks.
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