I Just used the search tool, and i didnt find anything containg this so, ill ask. And i hope this is in the right place.

Where does the server stand on using custom heads from HAK packs?

Is is ok to use them, or is it against server rules?

I don't know if it's against any established rules, but we will not support any custom head packs; I believe most of EFU's players use few to no overrides, and we usually see characters with custom heads as headless. Please be considerate: don't break our immersion by using custom content we can't see!