That is one of those questions that is "If you have to ask, then....".
I mean, anything can be done with enough time and money. There isn't anything "specific" to that model, because to do what you want to do would essentially apply to ANY transverse FWD unibody car. The only difference is, that truck uses a leaf sprung solid axle in the back, so you could probably use any small live rear axle in its place... take your pick. But chances are, it would have to be something tiny, and that means old. Some old Toyota or Nissan (Datsun), or even a Chevette. There were also some RWD British cars that had live axles that were tiny. That would take care of the basics of the rear, but the engine/gearbox at the front would require some serious cutting and fabrication. You'd likely have to use an entirely different steering and possibly suspension system... again from something similarly arranged... since most transverse cars, including the Caddy, have the steering rack right in the way of the proposed powertrain swap. There likely isn't room or a solid foundation for a top mounted rack, like most of the older longitudinal VAG cars use, as well as some later Hondas, so you'll have to do a bottom mounted rack (like many longitudinal cars and trucks use). Again, the source pool is pretty vast... and again, you'll need something tiny.
