enable viewing access to anonymous user
Content Access has "Per content node access control settings" available for each content type.

If you navigate to the "Access control" tab for your content type (or navigate to admin/structure/types/manage/content_type/access) you should see the following fieldset:



As the description suggests, once you've enabled that setting each piece of content of that content type will have an 'Access Control' tab. From there you can decide which roles should be able to access that individual piece of content.

This is what the 'Access Control' tab looks like once you've enabled that setting: