Depending on the year or powerhead type you may have to add nipples to the powerhead if replacing completely. Sometimes they are capped or plugged, sometimes you have to thread the location.
I would try first disconnection and capping the oil portion (don't forget to mix the fuel now) to see if you have to go any farther.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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