That is a very pretty bike...but I should point out that the seat-post and the shifters are both from a later period than the frame.
I actually sold those shifters to the seller, if I remember right (it was awhile ago)...they are extremely rare in my experience (but surely thousands were made?)...they are actually correct for an Alberto Masi Prestige (I think) and not for a 1974 GC from Carlsbad.
All that said, it's still very pretty. I'm quite glad it's not my size.
Charles "panto hound" Andrews
Socal