Ginola is well into the mid 450’s (I think!), and I know CJ was running something in the 600’s (a few year ago!).
Lots of people on here run in the 400’s...
Classics with 400+ are quick as they are lighter than newages...
My mechanic has a 500+ classic and that runs very nicely at lydden - combined with his knowledge of the track...
As I say - it’s about you having fun with what you have and finding your ability limit safely