If it's ready to install and you got a good deal, what does it hurt to have extra parts laying around?
I myself am restoring a '58 Indian Trailblazer right now and I've learned quite a bit in the last 6 months. I'm doing a "ground up" restoration too, and though this is my first bike, classic car restorations are nothing new for me. If you have any questions at all about repainting the bike, I can walk you through step by step what you need to do to achieve professional results. I've been painting muscle cars for 9 years and I won't steer you wrong.
I can also help you if you plan on rewiring the bike. I stripped all my wiring out leaving only the 3 wires coming out from the stator and rewired my bike from scratch using a Sparx battery eliminator a 4BS AGM battery and all new switches and lighting. Mechanically, there are a LOT of other guys that can give you WAY more info than I can, but there are PDF's for repair manuals readily available for download on the internet that have practically every spec you need.
Good luck with your project. Restorations are time and money consuming, but they are SOOOOO rewarding and worth it in the end.
Scottie