Crown Molding installation

[nedb52]

My plan is to install a 3 piece cornice made up of a 1/2X3 baseboard piece on both the ceiling and walls around a 5/8X4-1/4 dental crown. I have previously installed crown and always used nail blocks or a continuous nailer to firmly attach the top of the crown on the walls where the ceiling joists run palallel to the walls . My question is how to best add the this additional piece to the ceiling? How do you firmly attach the baseboard trim piece to the ceiling on the walls where the ceiling joists run palallel to the walls?
Thanks - Ned