"...granny gear..."
I’ve ridden a Pinarello Dogma with Campag, and I own a Colnago with Dura-Ace 9000 and a Diamondback Podium with SRAM Red. The Shimano is my favorite.
I’m not putting Campy on a mid price mid 80s Asian classic steel road bike. From the factory it had a 6 speed freewheel, I upped it to 7 because the chain stay dimension is the same. To go to a cassette I would need to spread the stays and mount all new wheels.
I have in the past laced wheels but that was years ago. I looked into new hubs, even if I just did the rear and rode with mis-matched hubs the cost is more than I can justify for the bike. I have also looked into just replacing the chain wheel from 52/40 to something like 50/38. With a 34 freewheel that I think would give me a granny alright.
But for the cost of a 14/34 freewheel and a long cage RD (both Shimano), I think I can get by, at least I hope that will work for me. If not I’m looking for a period donor bike to steel components off. Probably just be easier to buy a new or newer bike!