there's no reason on God's green earth to ever build a 10,000 RPM engine To win races
Unless you are running NHRA Pro Stock then 10,500 is your limit ......
If the rules of the class dictate a cubic inch limit then RPM is the alternative to make horse power - there was a car running a small HEMI on the salt flats as I recall - I would guess that crank came from a class racer at some point
But that would be a real difficult and expensive way to make HP in a HEMI