The old spindles were very, very close to being ISO. To be honest, other than Campy actualy stating 'ISO' in their literature I'm not sure there's much of a difference. I wrote a rather extensive thread/post on this not to long ago.

I was trying to run a later crankset (new, never used) on an early spindle and could not get the crank to run true and the bolts to stay tight. I didn't know about the spindle differences and pre-78 issues then. I just bought a late spindle, so when (if) I change it out, I'll report back. I can't say for sure whether the tapers didn't match, and I still had problems with the old crank when I put it back on (until I found the correct spot or orientation on the spindle). No more troubles.

Fleabay comes in handy.

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