I have a 1983 760 frame with a total 9-speed upgrade. I experimented with a Deore RD and 12-32 cassette, 53-39 in front, and it was a lot better on hills than the 12-25 cassette that I normally use. I ended up going back to the narrower range, I don't normally have to climb long steep hills, and I like having more choices at cruising speeds.
pics here:
http://www.flickr.com/photos/5720614...7627244603444/