There is not enough there to sell it as a bike. sell the frame and fork combo instead. You could bill it as a Bianchi frame with extras If you are going to sell the headset and bottom bracket with the bike, have them serviced first. Also, put the handle bars in the correct position. From that alone, it looks like someone thought of this as a beater and did not take good/any care of it.
I had a 1996 or 97 Premio. Low end Bianchi paid $600 for the complete bike with a very nice emerald green paint job. Touring geometry.
The one in your pic look thrashed compared to the one I had. I wouldn't pay more than $50 for it.
I remember my 96-97 being spaced for a 7 speed rear hub. I'd bet yours may be 6 so it would probably take some doing for someone to build it up having to find wheels to fit it. Usually the guys that do that stuff are guys that do it for fun and wouldn't be willing to pay much for your bike. Most would buy it at a super low price then drop a few bucks into it so don't expect to get much for it.
I purchased this bike over the summer. According to the decals it's a Bianchi Special Columbus. How would I determine the year? Is this a rare bike? I believe it has all the origins parts. Ultimately I would like to know the value of it and possibly get a manual for it. I have attached some pics and can get more. Thanks.