That depends on a lot. Rider weight, track setup, load on engine, gearing, etc.
Lockup and override need to go hand in hand.
My point would be this, if you have the power to require a lockup, you'll need an override anyway.
I don't know too many trail bikes with lockups on them...and this guy is looking to race pavement.
You tune how much the clutch hooks out of the hole with clutch springs. You tune how hard it locks up with weights on the lockup, whether it's bolts/nuts on a direct drive style or the amount of ball bearings you use on a slingshot style...