Mike,
Just clean everything off and make sure all of the
oil is gone. You can use a little brake cleaner or even paint thinner on a rag. Just get the rag wet in on spot about an inch in dia and wipe all of the
oil off making sure not to get any on or around any bearing areas.
Use non hardening rtv on all surfaces, install your gaskets and then put rtv on any seams that you see and you should be fine. That might be a little overkill but it has always worked for me.