Howdy

I want to replace the Huret Jubilee RD on my '73 Raleigh with a Campy Rally for some mountain climbin'. Recently, a shop owner told me the derailleur stops on the hanger are different for Huret, and the Campy won't work. Ive been riding and messing with bikes for years, and it has always been my experience that everything in the old days (70's) was pretty much interchangeable.
Unfortunately, I'm on the other side of the country from my bike, so I cant look at it right now.
Help!?
Don