12-10 Jet size

I am about to put an order in from treats and am thinking about trying a couple different size carburator jets. What size would give me the best performance for my situation?

1980 Vespa Si

Stock Carburator 12-10

43mm Olympia Top-End upgrade kit

Sito Pipe

altitude: 3000 (dont know if thats relevant)

Thanks!

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