as a general rule.. studs and bolts that go into dry / blind holes, .. i put in dry.
studs and bolts that go into water jackets.. i put on with thread pucky.
studs that hold nuts in hot place like the manifold.. I like to use neverseize to help out the next guy.. who may be me :)
head gasket on an N only takes minutes.. so shouldn't be a time issue.. :)