National,
You'll never get the 6200 rpm shifts without the kickdown hooked up.
First hook up a kickdown (detent) cable.
Then go see what you already have. Probably somewhere between 5k-6k.
You can grind the tips off the "nails", remove them, remove the inner weights, grind material off, then reassemble, use 6D finishing nails to replace the factory pieces. Bend the ends over.
Try unti you get it where you want.