Steve, as mentioned the joint between the upper and lower timing chain covers is a common leakage area. Do a "Search" by timing chain cover ... there is considerable information about that repair.

Double check that the valve cover gasket is seated properly at the back of the engine. It typically happens that the gasket gets misaligned in the back resulting in a large leak. Use an inspection mirror and a flashlight to closely examine that area to verify the half-moon portions of the gasket are seated properly on the head and in the valve cover.

Replace the O-ring on the oil level sender. Best to do that job during an oil change with the oil pan drained.

__________________
Fred Hoelzle