I had the same problem you describe with the pedal not returning fully. It is most often due to the cable not being adjusted correctly. CHeck out this link, it will walk you through the process.
http://www.pelicanparts.com/techarticles/911_clutch_cable/911_clutch_cable.htm
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Gone but not forgotten -
1980 Porsche 911SC w/ -22mm/28mm Torsion Bars | Custom Valved Bilsteins | 22mm/21mm Carrera Sway Bars | Elephant Poly/Bronze Bushings | Carrera Brakes | AJ-USA Brake Cooling | Carrera Oil Cooler w/ Fan | Elephant Strut Brace | Oh, and no ABS or PSM or A/C
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