First off, welcome to the board.
It's generally a no-fab swap, just need to mix and match mounts. Cost depends on how cheap you can get the donor for. The most difficult part of this swap appears to be the wiring. Also, if you choose a Scoupe, it needs to be 91-92.
Use the search and you should uncover more information. Another good source is the forums at
www.4g61t.com.