Rocker arm covers = valve covers; it's technically more accurate wording, I guess.

As for torque, honestly I don't recall measuring; enough to compress a cork gasket but not enough to bend the tin.
Generally I kind of sneak up on the final tightness after a few heat cycles.
I would guess I end up around *** mistake *** way off *** read on *** (face palm)
I like to glue or seal the gasket to the cover, and smear a little grease on the head-side of the gasket.