I just did this, in the end I removed the head to replace the shit gasket that the rebuilder used. According to the manual, you can remove the timing chain cover without removing the head. It says to be careful and not damage the small tab from the head gasket that runs between the head and the top of the cover.

You will probably need to remove the sump, I tore the sump gasket as the rebuilder used both a gasket and gasket goo on it (sigh).

When you put it back in, remember that there is a oil connector through into the oil cover that lubricates the distributor.

Download the manual from here, it has some pretty good instructions if you know your way mechanically around things.