Replacing some gaskets
I'm about to replace the supercharger coupler and replace the valve cover gaskets. First for the SC... I understand the supercharger snout needs to be sealed after replacing the coupler. Do I need an actual pre-made rubber gasket or gasket maker (silicone in the tube)? I see on INTENSE that they have L67 supercharger gaskets, but then in the description of GM gasket maker, they say "IDEAL for sealing the supercharger snout to the housing." Now I'm confused, which one should I use? Both?
Same question for valve cover gaskets. I see in some places people using gasket maker and in other places people using actual pre-made rubber gaskets (also available on INTENSE). Which one should I use?
(I more thing, do I have to drain the oil to do the valve cover gaskets?)
Tips, links, and prices are appreciated. thanks