Cab's fix should be fine for a temporary fix. I haven't used a gasket on intake end rails for decades. Next time the intake comes off, put the side gaskets on, sit the clean intake on it and look at the gap to get an idea of what is needed. The silicon bead needs to be a bit thicker than the gap to get a squish effect. Use something with some body to it like the gray Permatex. If the gap is wide, multiple passes can be used to build height. Blend the ends up into the gaskets. I usually allow it to sit for a few minutes, before dropping the intake on it, to allow the silicone to skin and tighten up some so it doesn't just ooze out when compressed. Clean everything with lacquer thinner before assembly.