With your experience, you won't have any issues with the universal kit, plus you have some flexibility with additional power accessories.
With my limited knowledge, I went with the factory replacement harness/fuse block. I purchase one from
www.bowtiebits.com and a few from
www.classicparts.com. I believe
www.lmctruck.com and
www.truckandcarshop.com, as well as, many other aftermarket truck suppliers sell the factory harness/block, so if you go this route I would check with a few sources for pricing, shipping and freight.
I hope this information is helpful and let us know how you make out with the re-wiring project.
Happy Holidays.