Just my thoughts on this. A donor vehicle might be the better choice as you would have all of the wiring and brackets to aid in the conversion. I would seek out some of your local LS builder for the build of the wiring harness. Here locally I have access to a Tuner that builds harnesses, he will custom build you a harness for your needs for $400.00. The first series (2000 - 2005 or so) LS trucks are becoming cheaper most had the 5.3L. I have seen pickups and Tahoe's selling locally for under $2000.00. It all comes down to how much work you are wanting to put into the project. Barnfind49 would be a great resource on this topic.
