Vito's makes the cheapest oil blockoff kit I know of. TM Designworks also sells one for about the same price. Either one works fine. Can't say for sure on the gaskets. I'd use Cometic if they are offered.
Im going to use the ones that came with my vitos bbk and use a little copper gasket adhesive.if youre that worried about all the vitos horror stories buy some moose gaskets.