I switched my stock Dellorto 14/9 with a Dellorto 14/12 that I bought off ebay last week for $10, and there is a huge difference in power and idling. My '76 Snark goes 5 mph faster, has better pickup and idles without any stalling.
The carb was in rough shape when I got it, but with a good soak, some new gaskets and a little tinkering, it runs perfect.
Larry