For the most part just making sure the oil system is up to snuff and upgrading your valve springs to prevent float at the higher rpm's. Do the springs and you mine's well do the valves while you're there.
I'm running a polished crank, PnP'd & high pressure 11mm oil pump from P&L, BC valve springs. I'm going to double check my clearances but I'm planning on being a bit on the loose side with STD size bearings, which is why I have the high flow/pressure oil pump. If the clearances aren't to my liking I may loosen it up a big with some HX bearings (extra oil clearance).
That's all you really need for 8k. To actually have a reason to spin to 8k, you'll want a pretty beefy turbo and some head word and cams to flow the air you need. Any more than 8k and I would consider larger clearances on the crank/rods, looking at some oil mods to the crank to feed your journals, and a dry sump oil system. I know some guys run 8500 or so on the stock style oil pump but I just don't trust it.