What model is that? I have always wanted a Torquise Bianchi. the tubing is custom drawn for Bianchi. I think it might be something like a SL/SP/Alle mix but I have nothing to base this on other than SWAG.
Here is what Bianchi has to say in their '85 catalog. the Formula tubes came along in '86ish and Formula 2 in '88ish. I am fairly certain your bike is a '87 model whatever it is
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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