depending on weather or not yours is rib or sib you may have to go a bit deeper than anticipated ,i once lowered a transom on a long shaft humber 16 sib to fit a short shaft, it went ok straight but would airiate or cavitate on turns , the reason was the inflatable keel profile ,we had to take off another 3 inches to get around it ,cured it in the end but the engine was really low in the water and when at anchor water would slop in but sibs are wet boats anyhow in general.
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