Blender to unreal 4 fbx import problems

I am trying to import static mesh I made in blender. When I import it in unreal it appears to be broken in many places. Also some surfaces are appearing transparent. Can someone help…

export settings… first make sure you’re normals are all facing the right way…

export:
in geometry select ‘face’ for smoothing

import:
select ‘import normals’ in normal import method