Thanks for the replies guys. The tick has gotten quiet over the past few days of driving it since being home. I'm not sure if that means something else or not.

When checking the rocker arms, is there anything else I need to check for while inspecting the rocker arms? Is replacing those pretty difficult at all? I've done it on a Japanese 4 cylinder once.

And to add, idle seems to be a bit hard/shaky, the motor seems to be burning a tad bit of oil and/or getting too hot to disperse it. The oil light will come on after driving around 2,000-2,500rpm (highway driving) for 25-30 minutes. That's probably a completely different situation though. Anyone have the diagram of the oil coolers on the M103?
Thanks again,
Jonathan