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Sorry to kick you in the teeth when you're down but I.Just noticed yet another budget feature on your frame - bashed in chainstays. Dead give away on cheap frame builds. You'll notice this Superissima has totally round, dent free chainstays, yours has the dents on both chainstays, to give a wider clearance with cheap, plain gauge, Falck/Aelle tubes.
Sorry mate, that and everything else nails it as 'budget'.
http://www.classicrendezvous.com/Italy/Bianchi/Bianchi/photo27.html
For anyone who isn't bored senseless by the above, here's a comprehensive photo gallery of a pukka Superissima, c 1982/83. They've barely changed in design since the 1960's:
http://www.classicrendezvous.com/Italy/Bianchi/Bianchi/index.html
I forgot to ask, (you maybe didn't think it was important) - are the drop outs stamped: Brev. Campagnolo?