I used an aftermarket harness from Speedway Motors. I like this harness for the simple fact that it used a molded fuse box. Many of the aftermarket harness are made from separate piece that are clipped or screwed together.
There really isn't much room under these Chevy dashboards. I had to make a mount for the fuse panel that bolted to the driver's side hood hinge. It's a little difficult to get to, but it was about the only place available.
Whenever I wire, I always crimp, solder and heat shrink the connectors. It makes for a very reliable connection that will be trouble free.
