I don't even use the front/ rear "half moon" seals, nor do I use the front/ rear gaskets on the intake. I just lay a big bead of sillycone down, spread it "in" after the pan/ intake is installed, and let it set.
I typically put a VERY small smear of silicone around the OD of the timing cover seal, as well as a REALLY very tiny smear around the ID of the balancer to seal the crank to the balancer