There are two ways you can go about it. I have done both.
Remove the exhaust system, drop the subframe and change it that way. The other way, and IMHO, the more time consuming way is to drop the exhaust disconnect the motor mounts and lift the engine.
I am doing this today to replace a leaky gasket (and worn out inner tie rod ends). Im doing it by dropping the subframe. Keep in mind, you will need a new exhaust manifold to cat gasket and a new oil pan gasket no matter which way you go.
BTW, how did you break your oil pan?!?
