Pull the powerhead off.  There are probably more bolts holding it on than you think.  That’s what I found anyway when I previously worked on the Gale Buccaneer version of your motor.  Watch the key/tab piece for the throttle gear on the port side of the motor when you lift the powerhead.  Don’t let it get stuck with the rubber piece.  Also, disconnect the correct fuel line.  Once the powerhead is off, then you will see the linkage to undo.

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Ken

carefull with the round carbon seal.. very fragile.

to drop the lu  make certain the brass cup below the spring  is out… line up the cross pin

the base gasket underthe PH  as  different patterns/year  so be carfull to order  the exact one if you broke it when pulling off the ph.

vintageoutboard.com may have some gaskets