Originally Posted by
muraii
One point of clarification: since my stuff is circa 2008-ish, I'm probably going to want to stay in that vintage, yeah? So, for instance, a new/newer Veloce 50/34 compact 10s crankset is unlikely to work with my older drivetrain, I assume.
...generally, a 10 speed compact crank will work with a 10 speed chain and a 10 speed rear sprocket...no matter the vintage. But it will probably look kind of fugly, and you'll might need to re-position the front derailleur a skosh. Again, the main things to worry about are the Campi-ness of the pull ratio between shifter/brifter and the derailleur, and the width of the teeth to mesh with the chain.
I've not tried that combination personally, but see no reason it would not work in theory.