Hi Patrick are you in England? That might explain the color.
We didn't have that Electric Rose color in the US in ;87 but judging from the script CdI decal and the square world champ decal I would say your frame is an '87 Campione de italia. These, again in the US generally came with a nice mix of Italian parts, Ofmega cranks, Modolo brakes and a Suntour derailleur set. I would suspect someone added the 105 group at a later date. I believe that 105 group was introduced in '90.
Great looking Bianchi I love that color.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk