Aluminum drums were listed as special equipment on 61-63 Tempests.
Rather than paying $100 for new steel drums, I wonder if the inexpensive Datsun 240Z aluminum drum could be made to work. The centers would need to be opened up on a lathe and the bolt pattern redrilled, but many other car guys are using them as an inexpensive alternative to hard to find stock drums. Besides looking pretty cool!
http://www.gomog.com/allmorgan/datsunbrakedrums.html
Check it out.