Check out the Tread and the interview about Obree aka the Flying Scotsman about attempting both the 1 hour record and a land speed record both on steel bikes.

http://www.bikeforums.net/showthread...tage-quot-look

Being faster than any of us, he's worth a listen " it's not about weight it's about aerodynamics of the body". RobbieTunes hit ithe nail on the head, If the bike is set up properly and you have the "skills" unless your at 100% of your ability, vintage vs. modern is really not that much of an issue it seems.