It depends on the age of the Campy hoods. If they are young and the rubber is still springy and fresh, you should be fine with stretching them - slowly - to get them out of the levers. Old Campy sets of hoods from the 1980's and back are worth a small fortune - if they haven't turned into dust. You'll see those selling for over $200. So if they are old - I'd leave 'em.

It can be a beast getting hoods onto the levers as well as off. Clear your schedule. It's a slow and gradual process. I just put some of the new knock-offs on a set of Campy Super Records from the 1970's. They didn't have hoods. I did my homework - and my eyes popped out when I saw the prices the originals were commanding.