Yes, they are compatible. You could also use a 1994 - 1998 Suzuki Swift engine. Or if you can find one a 1994 - 1998 Pontiac FireFly engine. Hope this helped.
It depends, if you want a used motor look at your local salvage yard. If you want a new one look at Advance Auto or Autozone. I purchased one from Advance for 1500.00.
Probably, but I wouldn't try that. It may overload the Metro's tiny electrical system if it is a first generation model 1988-1994. Plus, it would lower your MPG on such a high MPG car.
It depends on the year and wheel configuration of your metro. Most metros have a 4 lug 12 inch wheel design whereas the Prizm has a 4 lug 13 - 14 inch wheel base. They may fit on a Geo Metro...