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The clutch is controlled hydraulically. There is a master cylinder behind the pedal that pumps fluid into the slave cylinder over the transmission. When it is hard to push down, then it could be frozen hydraulics or a clutch pressure plate problem, but the fact it is also slow coming up means it is only the hydraulics. It could be master or slave. But since the slave is out in the engine compartment where is can rust, I would guess the slave is more likely. I was able to take the rubber piston seals into a clutch specialty shop and they found BMW parts that were a perfect fit, for only a few dollars. To take the slave cylinder apart for cleaning, I would suggest using the fluid pressure to pop the piston out by removing the cylinder but keeping the line attached. If there is any rust, it must be removed with fine emery or steel wool, but all grit must then be washed out. Then use brake lubricant to aid assembly and prevent future rust. If the slave does not do it, then do the master cylinder next. It very rusty and if unable to find a new one, the old one can be chrome plated back to spec.
It sounds like the transmission fluid pump has stopped working correctly to generate the correct amount of hydraulic pressures to shift into 1,2,3,4 ect. Try having the pump replaced. Or it may be the transmission shifting cable. Either way a mechanic should do this. Thanks for asking!
You can get Alfa Romeo 164 Technical manuals from http://www.dr164.com/manuals.html
The clutch pedal sticking down is normally due to the damper sticking. You can see it just above the gearbox bellhousing. If it's not obvious, track the hydraulic line back from the clutch slave cylinder and you'll come across a disc shaped object with 2 hydraulic connections. You can either bypass this and rebleed the clutch cylinder (normal practise) or replace it and rebleed. The AR part number for EURO 1992 12v V6 cars and USA 1992 12v V6 cars is 60556925.