No, RTV is not correct. It's too thick and will give false torque readings, as well as clog things up when it goes to the wrong places.
The Teflon pipe "dope" is okay. We use Permatex "Aviation" for this, on the threads ONLY. Unless the heads have been drastically ported exposing the bolt holes between intake runners, no need for sealer on the top. A drop of engine oil is all that's called for.
When it comes to sealer, if a little is enough, A LITTLE IS ENOUGH! (a LOT is NOT better)