http://www.fastestlaps.com/track26.html
I have a feeling that modern tires would help the older cars' lap times considerably, especially the super-cars.
And suspension. Today's F40s are all using modern tires and the CS is still noticeably faster on the track. I don't know about the F50s as they are rarely on the track.
I wonder where the Scuderia ranks on that list. I seem to recall the Scuderia getting identical times to the Enzo at one point.