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Sounds way too rough for even 3000 euros.
Running rich won't be the diaphrams in the Z-S but most likely the fuel enrichment circuit. I don't think exchange SET of Z-S for 400 euro is too horrible.
Definitely replace the brake line BEFORE driving. Hot brakes can lead to torched bearings (oil actually but sticky oil does not lubricate well).
A "rebuilt" engine could have used many old parts (and likely did). If the cam comes up "flat" take a pass unless the guy is willing to give you a big discount. The "cam problem" was really with the lifters and they tended to die quickly or not at all.
Mike!
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