Welcome to the site! That looks like a pretty solid project car you have there. You'll find lots of help here about wiring or anything else you want to know. And, yes, a build sheet helps value. How much is more about what's in the car than the actual buildsheet, but since it will verify options, it's always a nice item to have. Most of us wish we had ours. If you have yours, Barry (Alaskan T/A) would greatly appreciate a scan for his files.