it depends on what shifters/number of speeds you intend to use The campagnolo 9 speed era is probably the most awkward . You can get campagnolo spaced cassettes for shimano by ambrosio for example if going 10 speed but that isnt period correct for that bike. Or you could try and find one of the mavic cassettes which came with two sets of spacers. Or you have to mod a cassette yourself- easier if you have lots of old spares admittedly.A campag 8 speed block has similar spacing to shimano 7 but you would lose a gear- so then you use thinner sprockets off a 9 etc it all gets a bit mad. One issue is Campagnolo spacing is not the same throughout the cassette in some instances. I have in the past taken sheets of sandpaper to plastic spacers to get them just right. I would say its always going to be a # up so the best option is sell the wheels and buy something suitable and equally nice.