Nowhere in the Factory Service manual, or the Factory Repair manual is the use of an anti-sieze agent recommended for a spark plug change.
Also, the standard for torque specs always assumes a dry thread (unless specifically noted otherwise). If you use any kind of dry or wet lubricant, you need to reduce the torque spec 50% or find a lubricated fastener torque spec chart. If not, you will over-torque the fastener because the torque spec takes into account the friction present in a dry threaded fastener. Over-torque risks over-stretching the fastener or stripping the tap, in this case, the Head.
