how to display a block in a content node

For Drupal 5, there is

http://drupal.org/project/insert_block

but it inserts blocks in individual nodes, not in node types. You could use a node cloning module instead of a node type, create one node with the blocks you want and then clone it. To do this, choose one of these:

http://drupal.org/project/node_clone
http://drupal.org/project/node_template
http://drupal.org/project/skeleton

Other routes which you can take, depending on what kind of information that block contains:

- Define a theme region instead of using nodes, place it where you want, and put blocks in it (theming skills required).

- Use views instead of blocks (with the views module), because there is the http://drupal.org/project/viewfield module which inserts views in whole node types.