76 wiring harness?

Are you looking for no brainer OEM type harness that requires no modifications? If so it starts to get pretty expensive. American Autowire or M&H (Yearone) seem to be the closest to it.

If you're at all electrically inclined you can do it much cheaper. Over the winter I completely rewired my 1975 Duster using the EZ Wiring harness. $185. But my car isn't stock anymore (added new dash and aftermarket gauge cluster). Looking back this harness would have worked to replace the stock one, just requires some fiddling around.