i would say kieth craft racing would be a good place to look for a big stroker kit like that. btw if you start wth a man o war 351w block you can stroke and bore it out to 460 cu in.
here is a link to a article in popular hot rodding http://www.streetrodderweb.com/tech/0509sr_windsor/
The nuclear option is the Limited Edition 460-inch Man O' War, which uses aluminum lungs, 10.5:1 forged pistons, a roller camshaft, and a bunch of other high-end goodies to make 575 hp. Don't forget this is a small-block engine, not the iron lump out of an old Lincoln.