It seems to me we've had this discussion before. According to Bill Shaw, the "original" displacement for the boats was based on an empty weight but around 1965 or so, the standard went to 50% of fuel, food and crew. [Or was it the other way around?] Anyway, that's why early and late ad flyers have different displacement figures.
As for the 200 pounds, any Ariel or Commander with an outboard setup got the 200 pounds of lead in the bilge to compensate for the Atomic-4 that was missing. I believe this was simply a racing accomodation so that the boats could complete equally. By now, of course, most racers have sold the lead pigs . . .
For an all up weight without crew or fuel (but with a lot of mods) check Geoff's Aussie thread. Figure is in Kilos . . .