"As new" data from Simon's Porsche 911 SC site, although obviously with 29 years and over 100,000 miles on her she's probably not making these exact numbers right now! Apparently she's one of only about 1700 though.
Still pretty good numbers for it's age, and the torque/tonne value probably helps the fact that they were originally quoted with ~6s 0 - 60 times and it doesn't appear to have lost too much from that over the years (or at least it doesn't feel that way, the pull in 1st & 2nd gears is still phenomenal! )