I am trying to place a block, that contains a navigation menu, within the Navigation region of a Bootstrap themed Drupal 7 site.

The menu is drawn vertically, I assume from the fact that it's a block within the region, and it's overwriting some of the CSS..

It also seems that the UL that is generated for the menu doesn't have the necessary "nav navbar-nav" classes.

Is my only option to override the region.tpl.php, block.tpl.php and the definition for UL (which I have yet to find)?

Thanks in advance..