I picked up a late 80's Merckx Corsa Extra over the weekend which has Record and Dura Ace components. It has indexed downtube shifting which works flawlessly with Shimano 7401 shifters, rear derailleur, and rear cassette. The hubs are Record. I am interested in knowing whether or not I could put a Campy (preferably Record) rear derailleur on there and have any hope that it would shift properly in indexed mode. Anyone have any experience with this and want to share problems, successes, advice, etc? Thanks for any info!