[support] can i hook a hook?

[sebastian]

Hello,

Having a terrible time finding anything about this, and all I can find 
on Drupal.org is the API for hooks, which doesn't really explain enough.

My question is, if there is a contrib module with an implementation of:

hook_block()

such as:

nodeasblock_block()

How can I change the values inside of this function, without changing 
the function directly?

can I write something in template.php to catch the nodeasblock_block 
hook and then change the values in it?

Or do I need to change the nodeasblock module directly? perhaps adding 
the feature as a full blown check box addition or just hack it??

Thanks for any help you can provide me!

kindly,

Sebastian.