I don't expect a specific answer for this, but its worth a try I guess.

Under WOT I hear a type of... Rattle noise... From the driver side of the engine bay. It sounds almost as if you had a big bag of marbles and were bouncing the bag around. It's only under full throttle that I hear it. Sounds like maybe from the head? Hard to tell from the drivers seat. I've investigated it, couldn't find any loose bolts or fittings or anything.

Now I do think I have a pulley getting ready to go out but I don't think the two noises are related. Under normal cruising condition with maybe 25% throttle I get a wobble sound. Goes away with more or less throttle.

The rattle, wobble, or both?

That was my guess for the wobble. Or water pump. But I can't see how the pullies can make that chatter.

The car idles fine, drives fine, pulls strong. Nothing in the oil, coolant is clean.

I would say... After a cracked the valve cover? Two hairline cracks. I assume the notice was just sounds coming from the head and was more noticeable due to the cracks letting sound through.

I have a new valve cover and gasket now.

Hopefully it's not really bad audible detonation.

Logger shows no knock. And like I said, it pulls hard at 18psi.

I'll check that out on my next day off! I didn't think suspension. The sound "sounds" like its coming from higher up than that but who knows with how sound travels

Good question I've never checked. They removed all the emissions, egr, ect stuff that everyone removed so I would assume the PO did a balance shaft elimination on his rebuild. But ill double check to be sure.

I assume you are suggesting that for the wobble noise and not the chatter.