Hello I will help you with your question
The specs and the sequence are below
I share your confusion so here is the procedure where it becomes clear as mud
I checked two more databases and the procedure/specification is the same so working from experience if you increase the torque by 18 ftlbs each stage you are at 54 ftlbs before you turn the final 180 degrees.
Sorry I did not include the intake manifold in the first post
The spec is 18 ftlbs (Surprise!) and there is no order specified so I always work from the center out