Hey Dave
Probly things you wanna replace are:
-Seals that the top nuts that hold the rocker covers sit on
-Injector seals (while theyre out you might as well)
-Probly a good move to get new camshaft bolts, you might be alright but i had an old one snap on me while trying to go back in.
-Replace your camshaft seals (bursons)
-Just any other things you can see that look old and worn see if you can get them in before it all goes back together