Myself and others just replace the bushings in the upper and lower crank case halves, works very well, we also snug the fit a bit, to help with crank case compression… we also replace the bushings in the gear case, replace driveshafts and gears when necessary…also making new prop shaft…
They run really well after that kind of lovin given to them…
http://www.richardsoutboardtools.com
classicomctools@gmail.com