maybe I'm a freak or something, but I didn't think it was that big of a deal to pull the thing out. Only took half a day.

It is probably the turbos. it is a rather common issue.

unless of course you did something to it, like try and replace the PCV valves and you accidently installed them backwards. That will cause you to blow smoke all over too.

Then of course, there is always the possibility of a blown head gasket too.

My advice. Set aside a few days. get everything together, including a FSM (not a chiltons or hayes, they are rather inaccurate and miss some steps here and there) make sure you have a good idea of what you're doing before getting into it. Then pull the engine out and go over everything, starting at the turbos until you find you cause. I highly suggest going the extra mile and doing all of the extra work that should be done and might need to be done in the near future.
Personally, I'd pull it out, pull it all apart and at least do the 120k mile maintenance as most Z's haven't had it done. get new gaskets all around. replace the head gaskets. Hell, rebuild the turbos. Get everything all nice and fresh and bolt it all back up.
No sense is pulling it out, to fix one thing, just to have to pull it back out in a few months to fix something else.