Speedometer reading will be 3.7% fast.
When your speedo reads 60mph, you are actually travelling 57.8mph
But since you have a
kilomenometer, that'll be reading 96.5km/hr when you're
actually going 93km/hr.
Using these numbers and your 2.97 stock gear ratio, your new gear ratio will be 3.09:1.
Not far off what I will be with my new slicks, which is 3.03:1.