Add unlimited fields to block module
You might be looking for Node Block module.

With this module you can make your block fieldable, like your content-types.


  This module allows you to specify content type(s) as being a block.
  This allows the content managers of the site to edit the block text
  and title without having to access the block administration page.
  Users only need edit access to that node in order to edit it.


Check out this quick Demo Video