I am working on a chrysler powered toyota previa for the masses as well-- I spent 2 hours laying under one at the jy with a tape, pen/pad and a camera. it looks promising. the engine will split 50/50 at the floor level, landing at the top of the rear bench seat bottom cushion and 13" south using the toyota hanging peripherie boundary layer, that is, the lowest ghost line where the bottom of oil pans and spare tires are. It wont have droopy diapers. much nicer coach than the vanagon too.
photos and scale drawings to come......