Natalie and TammyK,
I used to make a lot of emulsion transfers with Polaroid 664 black and white film with the specific instructions for it in my book Polaroid Transfers, and on the Polaroid website. However, recently I've had several students say that no matter how long they boiled the print, they couldn't get the emulsion to separate from the paper substrate. I'm guessing that something has changed with the film. You could call Polaroid's technical assistance hotline at 800-225-1618 and ask for Sue Gagnon. She might know. What happened when you tried?
Kathleen