Look at my restoration thread. I've just done the exact thing you are doing.
I highly recommend an EMU black from ECU master. It's got all the functionality you'll ever need, at really good price. You can also buy a wiring loom from them, it's a diy solution, really easy to make your custom wiring loom.
Add a painless relay/fusebox and you'll have a great secure setup.
Thankfully the 280Z makes it quite easy.
How will you control the ignition and timing?