Campy 8 speed will shift your RD at 6.66mm cog spacing. That's not even close to anything.
You'll need Campy 11 to shift old DA (74xx) in either 7 or 8 speed mode.
Hubbub cable routing gives you 5.5mm spacing, good for an old standard spaced 6 speed.
It's all here:
SHIMERGO
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Last edited by Ex Pres; 01-26-17 at 08:08 AM.