ISO BB = International Standards Organization Bottom Bracket. This concerns the threading in the bottom bracket. Italian bikes use a different threading. Dropouts are where the axles attach to the fork and the rear triangle. I'd go with Campagnolo if possible. A lot of these bikes were originally campy. Watch for clearances. Older frames may not accommodate today's large rear clusters. Based on the "crown-less fork, I would also guess a newer frameset. I have Mavic aero wheels (Ambrosio) and hubs.

Cheers

Charles

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"Anything worth doing is worth doing poorly..."