A friend bought a 400 B based block for a clients build. He mentioned having to tweak a few things, but the casting looks pretty solid. It's a twin turbo (a pair of 76mm turbos from memory), Trickflow 270 headed deal for a 68-69 Charger. Not sure how they're going with it, the guy that the client got to do all of plumbing, intake and oil pan produced a bunch of grossly overpriced rubbish.