You're looking at serious money for a euro S52B32, so I'd probably throw that idea out right away. As far as whether or not to install cams and/or a supercharger, it depends on what you want to do with the car.
If it were my car, I'd just repair it to stock condition, but use ARP head studs.
1998 BMW 328is
1966 Pontiac GTO
2007 Subaru Impreza 2.5i 5-door
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