to start with back in the 80's Freewheels were the standard
and unless you have weird french threading there should be
no compatability issues.
Hell back then I couldn't afford campy freewheels and used
mostly suntour (ultra6 and winner), some regina some everest.
that's the beauty of old components mix and match was the
rule. It's sad that the generation brought up on Ergo and Sti
have no idea about compatability, that its full gruppos.

marty