I have a 1967/8 merc 350 that I am in the process of bringing back to life -- I have searched the forum to find a solution for the engine being stuck in gear -- I have removed the lower unit, rotated the shift handle to the forward position and replaced but the engine remains in forward!!! I do not have controls so I am moving the shift mechanism by hand inside the motor. From other posts I have positioned the shift rod in the full counterclockwise position but still stuck in forward. Does this mean I need to tear down the whole lower unit?