Does the bolt line up on the middle, upper or lower centre of the crosshead frame?
It sounds as it you will need to raise or lower the engine but in my experience, not by much and you could well do it without unbolting anything at all or at most the nuts on the bottom of the rubber engine mountings. the holes in the timing cover are enlarged so will allow a bit of 'angle' to be applied to the bolt to help clearance.
A trolley jack with a flat piece of wood between the sump and jack will work.
If you still don't get enough clearance, you shouldn't need to go to the trouble of dismantling too much. Work out which angle of tilt will work best and simply loosen the engine mountings on that side and position the trolley jack appropriately to the side that needs lifting.
Hope this helps and good luck!
