Just wondering what vintage you wanted exactly? Some of the older/first Campag 8 speed cassette freehub bodies had a different spline pattern to the later ones, so need special/rarer cassettes.
I've got a set I might consider selling, if you want something appropriate for late 70's to early 90's
The Regina 8 speed freewheel is compatible with 8sp Campag indexing, it was NOS back in March, my son has put about 400miles on it this summer. Posted I'd want £310
Rims: Ambrosio Super Elite 700c
Hubs: Campagnolo 1034 Record low flange Italian thread
Hub Skewers: Campagnolo QR
Nipples: Chromed bronze
Spokes: Stainless Steel double butted
Cassette: Regina Extra “America” 8sp 13-26 (35x24 Italian)
Or if you want a more modern cassette, theres these from the good old USA... Once you've paid handling I think you'll be looking at around £300
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