I'm working on a 1976 55 Johnson that had locked up. It has since broken free but I thought I better take a look at things. Pistons and cylinders looked spotless. Took the intake off and things looked great in there. Took the rod caps off and the bearings look burnt, discolored. Figured I would pull the powerhead. Shift shaft is loose and all the apparent bolts are out. The gasket let loose everywhere except the front edge. Did I miss a bolt(s) somewhere?