6k FF 1.6 anamorphic settings

So sorry for the newbie question but….
I have a Sirui 35mm x1.6 Anamorphic lens (Saturn) if I shoot in 6k open gate what will be the correct project settings (resolution wise) in Resolve?
I have a Sirui 35mm x1.6 Anamorphic lens (Saturn) if I shoot in 6k open gate what will be the correct project settings (resolution wise) in Resolve?