You should be able to create a standalone harnless with a new fuse box set up. I usually use a Painless 7 circuit Aux Fuse setup. That usually is enoough for a basic setup. If you need more circuits, the setup is expandable by adding another 4 circuit block on.
I then setup a another fuse and relay setup for the Elecrtical Fan if your using them. http://www.summitracing.com/parts/PRF-70207/ http://www.summitracing.com/parts/PRF-30002/
see my project post #98 and #100 for what I did.. 1971 Nova Swap - 02 LS1/A4
If your not good with wiring and can not find anyone local to help, you can look up one of the sponsor vendors to convert your factory harnless or buy a new custom one. But it is a good thing to learn about the EFI and wiring, it usually takes a few hours for the 1st timers, just need to read the FAQ and get the pin out of your year/model harness.