72 C-20 Help

[saddletramp]

Evening guys im confused i have a 72 C-20 pickup my hamonic Balancer was bad i got it off the shaft on the balancer broke right where the key way slot is im trying to find out what you do with the new key that came with my new balancer do i just grease up the crankshaft and set the key in yhe slot then use my install tool ? bigger? Is do i need to mark the balancer for timing i thought thats why the key way is there to Keep the motor timed . Saddletramp