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A catch can IS an oil separator. Technically you are changing part of the emmisions controls so you could fail an Inspection but if you are just adding a catch can between the PCV valve and the intake manifold you are actually removing oil from the air.
Just don't add any kind of breather cap, that will definitely fail.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.