Just purchased a 2001 Subaru Legacy Wagon, motor runs strong, but kind of knocky

What is your question?

Prior to my purchase, the car has received: NEW water pump, hoses, head gaskets redone or replaced (sadly, I don't know which) Timing, alternator and belts. The engine has 101,689 original miles. I notice a burnt oil smell when I get out of the car after driving. Ideas? Oil pump? Seals? Thank You!