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naakotnieks
If you want to run 8 speed on a later hub, you need to adapt a 9 speed cassette. Remove one of the sprockets and swap the Campag spacers for a set of Wheels Mfg Shift-8 spacers.
However, Wheels Mfg have discontinued the Shift-8 kit, so you will be looking for a second-hand kit (good luck with that).
I have seen an 8 speed cassette jammed onto a 9 speed freehub: trashed the freehub and the shifting was all over the place.
Campag 8 speed spacers in a 9 speed cassette won't work: 9 speed sprockets are thinner than 8 speed, so 8 speed spacers aren't thick enough.
An unmodified 9 speed cassette won't work with 8 speed shifters: centre-to-centre (ctc) 8 speed spacing is 5.0mm and ctc 9 speed spacing is 4.55mm.
TL/DR Technically it's possible to run 8 speed, but realistically you need to upgrade your drivetrain.