Just the valley pan unless there is a reason to need something more to seal it.

On my engine the ports were bigger than the valley pan, so I had to grind the valley pan to fit. I was worried that I had to grind some of it pretty thin in some spots, so I glued the paper gaskets to each side for some extra insurance.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street