Don't talk about it just do it, get the bike, 850s are pretty reliable owning mine since new and have never had any problems with Lucas wiring, but then I did my own wiring and made it simple when I converted to the Featherbed frame and now with the Joe Hunt maggie my wiring is even simpler, just a small battery for bright light when I need to use it more for the brake light as no longer do much night riding on the Norton I have my modern Triumphs for night riding, my Joe Hunt is always a first kick everytime as it puts out such a good spark and with the RGM folding kick and is also longer its even easier to kick to life and mine is a high compression motor, I am 62 now and have no intention of giving up riding, 49 years now without a bike, so good luck and get back on the road.
Ashley