Actually, the air filter wont even fit. Its too tall on a C-350. However, the air conditioning pumps are interchangable. Anyway, chances are if your 350R came out of a 442, its not a chevy. You would be a lot better off just assuming that nothing would fit. Theres enough aftermarket for the olds 350 that you shouldnt have to worry about cross-breeding with a chevy 350.