I'm fixing to have to do a rebuild on my GN. It's getting a little loose under the strain. I've been using the list of parts from the articles in GMHP as a buying guide. The only thing that's not metioned is what gasket set is being used. It does mention which headgaskets and main seals though. I'm going to use the factory headgaskets, but was looking into a complete kit for all the other gaskets. Any recommendations?