Great, glad you were able to get something done for it. If you can learn about running SQL queries, that also helps with mass editing. Using your scenario as example, running this query takes a few seconds and changes all mobs with race 367 to 60. I don't use Heidi, but if you have a feature in there to run a query, it comes in handy.
Code:
UPDATE npc_types SET race = 60 WHERE race = 367;