1992 Honda Civic Engine Oil Leak

Hello,
I recently changed the valve cover gasket on my civic, because I thought that is where it was leaking. The car continues to leak, but significantly less. It only leaks when it sits for an extended period of time. It seems like there is a decent amount of build up underneath the distributor cap but it is difficult to tell. If someone could please help me reach a resolution, I would greatly appreciate it.