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permatex #1, the thick brown goo in the toothpaste like tube, P #1 sets up hard. Have the block hole scraped or wire brushed clean of debris/old sealant & a quick wipe with a rag/brake kleen. light/moderate app of P on the hole and generous amt on the plug (extra ends up on the exterior). Use a large dia of socket that will fit into the plug to drive it in. Most prefer brass plugs & have good luck with them. when plug is flush I wipe a smear of P around the perimeter for a complete circle of the goo (as needed). EDIT use a brass drift on the socket (or a 1/2" drive socket/1/2" extension but it can mar the extension), do what works for you & drive it in with as few strokes as possible & keep everything in line for each hit. get the plug started in square with a medium hit then drive it home (flush) with several good solid whacks. #1 #1 you wanna keep it from tilting

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Another vote for Permatex #1.