A new cam may not be the answer!
Oil and filter change first!
I've done that, tried a few different grades of oil. The best I've found to quieten it down was valvoline 20-50 (spelling?) Changed the filter and it's even had a brand new oil pump fitted. Even changed the cam followers

Gotta be a new cam now right?
If I could afford to just get a 1.6 or something then I would but insurance costs and the initial layout for the car would destroy me on student money