Darren,
Much good advice on this topic by seaching "head torque" (without the quotes) by using the Search tab (under your avatar picture) two to the right of the "HOME" tab. I'm not providing the tech answer, because many others here are better for that, and there are differences of opinion. One thing for sure, you must use thick washers that are very nearly the diameter of the landing area and close to 3 mm thick. I doubled-up on single washers, which, I think, is almost as good as having the right parts.
As for head paste, I use Permatex Copper Spray-A-Gasket. Others will say to use something else, others will say use nothing. Everyone, I think, will say to be sure the gasket is annealed dead soft, which, despite claims to the contrary, is not true of gaskets fresh from suppliers.
Richard L