Thanks guys.
The classic update kit is great. Most of the connections are already made up and you have plenty of wire in most cases. It's also nice because it has the accessory circuits which I'm using to power the LS harness, power seats, and a couple relays. Things that have made this easier and more flexible are the busses I installed and cutting a hole in the carpet to run wires from the dash to the console area. What really made the difference is all the time I spent researching ahead of time. I looked at the American Autowire diagrams, the gauge cluster diagrams, and how to wire up the LS harness. There are still surprises and things that don't make sense at first, but all the pre-planning has made this go really fast.
We should have just about all of the wiring done in the next couple weeks so we can test circuits and see things light up. I'm also getting close to pulling the trigger on a radiator. Once that and my column show up, I'll have all the parts I need to fire it up!
A little eye candy - I installed the plug wires the other night. Got them from Speed Engineering - these are the 12" wires. They have a choice of 10" or 12" and I didn't want to be short so I went with the 12".