Oil pump can be measured for wear, a repair manual should have the guide measurements. Do also check the operating axle of the oil pump (along with the vacuum pump) - there's often play there, and in that case new parts are needed.
I would consider picking up a complete engine gasket set. That way you would have a gasket for anything that you might have to take off the engine without having to either pay for shipping and wait for each piece as you need it or having to run down to the autoparts store 5 or more times.
Everything is just so phenomenally filthy all around there it makes me think it was leaking.... but i don't have significant oil loss.