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There’s a cam inside at the front of the gearcase that must be in the correct position. It’s attached to the end of the shift shaft. It should be noted in your manual as well. The shift shaft lock on top needs to be on the shaft in the correct position to ensure that cam is in the correct position.
Forget the gearshift lever at the box in the boat. Disconnect the cables and get it right in the motor first, THEN hook it up to the shift controls. Maybe a po put the shift blocks back into the controls backwards? You never know.
The cam is #2 in this diagram.
Honestly, I would call Dave B if you haven’t already. The guy is a guru, svengali, yoda or what have you. He’s been there and done that and remembers ALL the details.