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I'm not sure about your year truck, but I literally JUST ordered a American Auto Wire kit today for my 72 blazer. It has everything including single wire alternator swap, HEI/MSD ignition, plug in gage cluster so you can swap to aftermarkets easy, and new dimmer switch, headlight switch etc. The thing is the nicest out there from what I've found. Give them a look-see for your truck. A bit pricey but not out of line for how much better it is than painless. I got it from Mattsclassicbowties on eghey
I had them make a whole new harness for my truck, wasn't cheap though, cost me around $1500 if I remember. I did it about 5 years ago. Was money very well spent.
They make all the harnesses that Year One sales. In order for them to build you a new one you will have to send them the old. Plus it will take a couple mouths but it'll be done right.