Probably not much compared to a lot of S14s on here. Hell, people have paid close to $20K for a ‘clean’ one. A stock 240Z vs S14 is a laugh.
I really don’t think that’s valve float. It’s tough to float a mechanical valvetrain, and the GTR has a very good valvetrain good to 9,000+ rpm
If it’s floating valves it’s not shimmed properly.
It is a lot of money to be just as quick as a stock 120hp Subaru wagon though.