should i pp heads b4 nos
 

I am ordering nos on friday and someone told me that i should get a port and polish job done on my heads. my car has 105k on it and i am wondering if he is right and i am risking detonation if i dont

It definently will help you sincec you have a supercharger. I would go with a smaller shot than you originally planned if you get this done.

definitly colder plugs, as far as porting the heads, with nitrous, you are makeing the air charge more dense, so it isnt needed, but as far as power. airflow is the key with any engine.
an engine is nothing more than an air pump, the more air that it can get in and get out, the more power it has