Gaskets to replace while doing VCG's and timing chain cover gaskets?

[Multibeemer]

I'm chasing some oil leaks on my 03 4.4i (121K miles). I know the valve cover gaskets, particularly the passenger side, are leaking, and a mechanic I had look at it thinks the upper timing chain cover gaskets are leaking as well, so of course I will replace those while I have the valve covers off. Are there other gaskets I should replace while I have the valve covers off that could be contributing to my leaks? Thanks.

[Multibeemer]

By the way, has anyone here ever replaced their timing chain cover gaskets? Somewhere I read that the job is straighforward, but I'm having more trouble with it than with the valve cover removal - getting the infamous injector clips off wasn't even all that bad. The timing chain cover bolts are very inaccessible, particularly on the drivers side. I got the ones for the passenger side off, but the drivers side are tough. I'm going to try to remove as much stuff as I need to make more room, starting with the fan and shroud, which I need to remove anyway to replace the serpentine belts.