Well... Santa Claus came early to the GTOger Garage...

We're back on the road! WOOT!

I can't thank you guys enough for the advice, support, and general camaraderie. I've had a lot of cars in my day from pretty much every continent known for car making. I've even had a C5 vette. Nothing compares to the ZR1 community. Not close.
In case anybody is wondering, it was injectors. The #5 & #7 primary injectors look like they've been leaking for a while, based on the fouling of the plugs. I got a new set of injectors from FIC and gaskets from Jerry's Gaskets. Both vendors shipped very quickly and I found the parts to be of good quality.
My wife and I spent one evening tearing down, removing the plenum, pulling the plugs, etc. Man... they sure do cram it in that engine compartment. I guess the main concern was not ease of servicing!
Unfortunately we had to wait a couple of weeks to put it back together due to other pressing business. So this evening we started putting everything together and I'm happy to report the Z fired right up.
There was a bit of a buildup of unburned fuel left in the exhaust, apparently, because it burned off for a bit (smoke out the tailpipes). I watched all gauges and kept an ear peeled for funny noises. She just purred like a kitten. Once I was sure there was plenty of coolant and all the pressures & temps looked normal I gingerly headed out for a spin around the block. Which turned to another. And another, this time faster. Next time put my foot into it a bit. Then I turned on the secondaries. Yee haw!
All the unspent fuel did burn off and now she's running clean. And she's running MUCH smoother than ever before.
Tomorrow: oil change.
Thanks again to everybody who posted here. I'm really proud to be a part of this community.
PS: do I get a bonus rating on my avatar now for having passed the ritual of a plenum pull?
Merry Christmas, y'all.