Selected answers from the Dumb SEO Questions Facebook & G+ community.
David Gizzarelli: In my case, I’d have to error code 1, 2k urls ... never installing WordPress, again!
Neil Cheesman: John Mu on Twitter It doesn`t matter. If you need it removed urgently (eg, accidentally made something public), then just use the URL removal tool additionally to either 404 or 410.
Richard Hearne: you want them out fast 410 the URLs on response end. Then build and submit an XML sitemap with the 410 URLs with lastmod date now. That will see them gone pretty fast.
Neil Cheesman: Don`t need fast - just chopping out some old content that has little value