I am fairly new to Porsche and will be getting a 911 soon. I plan to get a 1975-1989 911 and have been offered a 1976/77 Carrera for £9500 with a pretty full rebuild and service history from a well-known Porsche specialist. The alternative is a 911SC from mid '80s for about the same price. What should I go for and what questions should I be asking??