[chevyrestoguy]

If the engine is already out, I would highly recommend drilling and tapping the crank. It can be done with the crank installed in the block. As a matter of fact, if you're going to do it at home, the block makes for a nice fixture for holding the crank in position while you drill.

Tapping the balancer on is about the only way you can install a non-bolted balancer. Heating the end of the balancer definately helps, but you have to be careful not to overheat it because it'll melt the crank seal in the timing cover and you'll almost be certain to have a leaker when it's running. Don't wail on it when you're tapping it in place. Remember, as Captain Fab said, the bearing face on the thrust flange of the crank is taking some abuse when you do that. A crank will move ever so slightly from front to back (it's called end play), and when you hammer anything onto the nose of the crank, the crank is being forced rearward to the limit of it's end play. Take your time and be careful.

If your crank is drilled, there are balancer install tools that are a breeze to use.