Try these guys, they make a universal harness that you can customize:
http://www.painlessperformance.com/
What I like is the modern fuse box with relays. I am planning on using them, and adding waterproof connectors from Digi-Key(same ones used on most modern cars).
Also dont crimp any electrical connector on a car, it will eventually corrode or vibrate loose, solder only. I even solder the crimp pins on connectors, cause these also come apart. Relay anything with any significant amount of current that uses a switch to turn on(head lights, fuel pump, ignition switch to starter, etc)