If the surfaces are perfectly clean you don't "need" anything... I like using a very thin layer of 3 bond on all touching surfaces and on the gasket itself... Yamabond or 3bond is really the only stuff I let near my motors... Except some RTV on rubber head gaskets....
I did notice my clymer manual says to run a bit of silicone on the base gaskets, but the manuals aren't exactly perfect!
Just get those surfaces clean and you really have nothing to worry about!