I would say the guard probably was a 1970 that got modified to the 1971 version, and just so you know (not knocking the bike, its VERY NICE :thumbsup
the wheels are incorrect, tires incorrect, and the shroud is wrong for BW as well. Also looks like it may be missing the rear reflector, cant tell for sure. Should pull the seat and see what the serial number tag looks like, My guess is the bike was built and not original BW but they still did a great job at it....shows very well!!!!
Have you ridden it yet? I LOVE the way they run with the dell's as opposed to stock configuration, kinda loud with the open pipe, but just a way better overall running bike over stock HS40's