As above,stripped and serviced one of a pair today specs are ;
30mm vents,
52 idles,
mains are 122,
carbs dated 1984 in great condition,
Air correctors and pump jet are as they should be.
Think it will be ok for startup after rebuild but also thinking those mains are a little small ?
Motor is 1.8 high compression ,stock carb cam and Euro 2.0 bus heads flycut with larger valves.
TIA.
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Mains don't seem super small mine came with 122's.

2056

34mm vents

60 idle jets

132 main jets

180 airs

Yes thanks ,think now the mains may be ok-ish considering what displacement difference between your motor and mine,now a bit unsure why all the AR carbs all have small idle jets ? I checked my other set (AF 33) which I believe are 32mm vents and the 135 mains make sense but the idles are still only # 52?.
These carbs appear to flow differently as they are a new design but a little .
Keen on more input,cheers.

Mine came with 28mm vents and the 34's I put on it made a huge difference. I think I would stick with the 30's you have and see how it runs. When I originally set mine up I was clueless as to what to what jets to use. There is a guy in Italy that I found on Ebay that has an Ebay Dellorto parts store. He made some recommendations that worked out well.

https://www.ebay.com/str/ALFA1750S-CARBURET...=p2047675.l2563