So I built this nice little LS1 to throw in my jeep, im looking for the best donor harness to get it going. It will have a 4L80E behind it, the motor came from a 99 vette. So obviously a harness from that would be idea but hard to find in Nebraska. Iv tried to do as much research as possible but nothing really answered my question. Iv heard in 03+ they switched IAC so that harness wouldn't work as easily. Is a 99-02 6.0/80 truck harness the best place to start or try and find a 5.7/60 from an F body? I do have access to HP tuners, I do not want to pay for a terminator set up right now. Since the engine is stock I don't see the need at the moment. Trying to get the best bang for my buck!