I've done this switch on a volvo 240, also a 3/4 tone gmc pickup. As already noted if you have the donor car it becomes a question only of time and perserverance.
Just be sure to evaluate carefully the value of your time as well as your skill level and your available resources re tools, workspace, etc.
It probably doesn't make sense financially but you'll learn something from it.
Keep a log and write down everything you do, as you do it. Stay relaxed, stay thoughtful. It's not a bad idea to shoot some pictures along the way also.
Good luck and have fun,