Sounds like the box is going (poor design for RHD cars). Every 166 I'd test driven had the same problem; you had to press the clutch pedal throught the floor to change gear. It got better as it "warmed up", but was really difficult in the morning.
I have just had the clutch pedal box rebuilt by my man at T I Auto Engineers in Dublin to great effect (Gerry - +35318386567). Biting point was in the floor and cruise control would not work - all fixed; along with siezed handbrake cables and a full 12,000 mile service, for £622. Not cheap but its like a new car.
Chris Flight
Ireland Section?? - AROC
1750 Spider Veloce (1968), 1.6l Giulietta (1985), 2.0l 75 (1992), 2.5l V6 166 (2001)
See Northern Ireland Italian Motor Club at
http://www.niimc.net/