Hey fine bike peoples! I am new to road biking and I recently purchased a late 80s or early 90s Bianchi Giro. After giving it a little clean up I'm realizing it is too big for my 5ft 9in self (I believe the frame is 56cm). I want to trade or sell it but I am unsure of even a ball park for the value. I don't want to ask too much or give anyone too big of a steal even though I got it for pretty cheap. The Serial # is 91M7055 and it has Shimano 600 brakes and a Dura-Ace Derailleur. Any help would be appreciated!!

Thanks,
Brad