Thanks for all the help from everyone. I've finished the upgrade, but it was a little more involved than I had planned. I ended up getting a Veloce Med cage 10 speed RD. I knew the pulley wheels would be too narrow, so the first thing I did was replace with my old sealed bearing pulleys. However, I didn't think about the pulley screws being too short. Got some 5mm screws from the hardware store that worked fine. Next problem, even though I used the original pulleys, the way the cage was designed still rubbed the original chain sometimes. So I ended up replacing with a new 8 speed chain. Problem solved. Next, because of the was the RD mounts I had to replace the shifter cable and sheath because it was now too short (anyone know where I can get the old style spring type sheaths). Finally everything was working. I when to adjust the RD limit screws and discovered that the low gear limit screw was too short for the 120 mm spacing. Argh! Went back to the bike shop and the guy found a longer limit screw from a junk RD that worked perfectly.

Now that it's all done all I can say is wow! I wish I'd done this years ago. It rides beautifully and shifts so smoothly and positively I can't believe it. Who needs indexing. Another advantage of the narrower chain is virtually no trimming of the FD. At the end of the day the whole upgrade: cranks, BB, RD, chain and odds and ends cost about $180.

Again thanks to all for all the advice.