Without knowing the year and model of your bike, or the model of your current crank... don't expect any helpful answers. More info needed!
I see on your profile it's a 2013 Bianchi Impulso?
The Bianchi website doesn't give much info, but I will assume you have an english threaded bottom bracket... if so, you will need appropriate cups for a 386 crank. http://www.performancebike.com/bikes...401088__401088