If you want a FWD V8, go grab an Aurora or Caddy. Or, I think I remember seeing someone swap a Northstar into an N body with a tight fit, but he also did a RWD conversion on it, so meh.
I see no reason why the Northstar wouldn't fit in a W body bay, its pretty roomy, all things considered. Loads of fabwork but otherwise, sure.
As far as these Luminas and Caprices are concerned, I'd bet they're RWD, but I don't know for sure. Too lazy to go find out, too
