After clean sludge from valve cover and rocker arms oil light illuminated on dash

I changed the valve cover gasket and when I did there was black stuff all over the inside of the cover and on the rocker arms. So I cleaned it with carburetor cleaner and a wire brush. Now that I go to start the car I hear the motor does not sound right and I am get an oil light on the dash. Do you have any suggestion on what to do? I am thinking there is a clog in the oil system due to all the black stuff I brushed off.