I don't want to rain on this guys parade because he could be a good deal for some people, but here's what concerns me:
(a) Does his harness rework include ECU reprogramming, not clear on his discription. What he does claim is that he eliminates the VSS, and I will argue with anybody on any day against doing that!!!!!
(b) Most of my customers find it very easy to use a stock GM harness unmodified. 85 percent of the wires already have a destination on the engine (no brainer because no two plugs are the same), then there are the 6 wires that we identify by location and color that go to destination that we specify. Any remaining wires are "excess baggage", they should be rolled up, wire tied, and stuffed away with the ECU. If all this sounds too difficult, then by all means use the internet guy!!!!!