SB Crankshaft Key Install

The new crank in my 340/420 did not come with a crankshaft key for the harmonic balancer. So, I pulled the key out of my OE 340 crank and deburred/installed it, and the height of the key is too tall for my balancer. It appears to be too tall by apx .012-.018” along the key.

Is this a fit to suit (grind as needed) when installing the key, or should I pull it back out, clean out the keyway, and try to reinstall it?


Thanks!