I am probably going to replace the StrongLight headset on my 1985 (?) Olmo Firenze with Campy NR. I might also replace the bb with a Campy NR, too, although it feels just fine.

How can I find out what size headset and bb I need for this bike? It's obviously Italian threading - but what about size of headset and size (?) of bb (it's a six speed freewheel).

Any help will be appreciated - Thanks