First Time GL450 Owner

Engine is a different story. There is oil everywhere with no apparent source (yet). The dealer removed one of the heads and scoring is apparent on at least two cylinders.
I have a low mileage replacement engine that I will be installing. Does anyone know the easiest way to pull the engine? I have a two-post lift and a transmission jack so out the bottom looks like it might be the way to go.
Thanks.






