You can get the woodruff key(half moon) at most hardware stores.

The timing chain job is not really any different than on a Chevy. The oil pan seal is a little easier because you don't have that pain in the $$$ front rubber gasket. The harmonic balancer slides right off because it's not tapered like a Chevy. You can leave the water pump attached to the timing cover and then you will not have to mess with the divider plate.
Jim