Isn’t the cup marked with the threading size? Can you feel or or see the reinforcing ribs in the bottom of the down or seat tubes?
With the Gipiemme dropouts it is likely Alle level or maybe even TreTube.
If you never had Faggin before I suggest building it with whatever you have on hand and ride to see if you like it before spend a lot of money on components
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk