The 1220 frame was originally a 7s rear - so a 126mm hub is proper, but I ran a 130mm hub for a while in mine without any issues so far (now it's for sale).
Actually the DB would probably work, they both will have english BB and it would match the crankset eliminating that issue. The DB has downtube shifters, where your 1220 had STI, so you'd be taking a step back there. Seatpost on the DB may be 27.2 if it's a Tange 1 frame, but if not that may not fit. Most of the rest of the components will probably swap over, headset, stem, bars, rear derailleur but not the front, but what you'll end up with is a 1989 bike on a 1998 frame. It'll work for a city bike/commuter, though.
Last edited by Ex Pres; 04-03-08 at 03:20 PM.