This is of of 1091 cars made because, other than being a Giulia Spider, it carries (at least once) the badge “Veloce”.
That means that the engine of these cars was modified to be moe powerful: it actually was the same unit installed on the Giulia Sprint Speciale and that means different camshafts, a couple of Weber DCOE2 (very expensive, when you find them), a bigger sump with a modifed oil pump and in some cases steel rods instead of the cast iron ones.
This particular car, although disassembled, looks in pretty good conditions: there’s rust in some areas – of course it’s an Alfa – but, as the seller says too, it seems solid and never crashed. The seller says also that the engine is the correct one, however many parts are in boxes and so they should be checked. Find it for sale at $35,000 here in Tangent, OR.