How do you seal your small block intake?

In your top photo, right where the harness loom / hose? goes down past the corner (lower left) SOME intakes (Ed?) have a gap there in the corner of the head / intake / block. Make CERTAIN you get that full of RTV. Like others I don't use the end gaskets.

Those cork POS gaskets go in the trash. As another mentioned, I trim that head gasket tab off.

Look at the bottom of your intake in the corner Del wrote about. The sealing surface is back from the leading edge of your intake. This is the corner that usually gets people. I also clean off the surface, place intake down, outline end seal surface for applying silicone. Watch the pass front corner... :)