Thank you, 2000TouringSp, but sorry, your list is not up to date: 2444 was a simple typing error, Vogt never sat in 2028, 2348 has nothing to do with Malinverni, etc. All this (and more) had been clarified in earlier posts.
Two new ones: Alfaronny sent me some links about old racing photos, there I found another two cars: The 1959 Rallye du Roussillon saw one SVZ with No. 68 with Jean Valette/René Lepy.
Valette had some more Giulietta entries in 1958, not sure with which type.
A second SVZ in the 1959 Roussillon rally was entered with No. 69 for Pierre Roueylou/Cauvet. Roueylou had Giulietta entries from 1959 until 1961, but also here, not sure about the type.
SVZ *09403*: #9403 is the last SVZ built in 1959 and mentioned in Anselmi's Giulietta book. As stated earlier, the known car now in the US lacks any period body line.
Now Jaycee sent me a small copy of an advert from 1984. The well known french racer and collector Jean-Louis Solignac had SVZ *09403* for sale, but when John arrived, the car was already sold (to Germany?). The pic is very small, but you can clearly see: it has the common 1958/1959 body style, but the front is modified, and ... it has a flat roof!
Sergio "Pegaso" Bettoja:
Bettoja purchased SVA *01461* just before the 1956 Mille Miglia.
SVA *02308* was purchased in mid 1956 by Candida Tupini Srl.
Then Pegaso had some entries in September/October the same year.
He raced a SVA in early 1957, according to its reg plate from the Giro di Sicilia dated 19570414 it already was *02308*.
In mid 1957 SVA *02208* came to Roma and was reregistered.
In late 1957 Bettoja then had some more entries, the 19571124 Targa Florio saw him again with *02308* according to Giugno's Giulietta-Targa book, but not pictured.
In early 1958 SVA *02308* was rebodied to SVZ, and it was still owned by Tupini (and never by Bettoja according to the ACI papers). Bettoja crashed it in the 1958 Targa Florio, and Tupini sold it 19580830 to Giuseppino Giordanello from Ancona, who resold it again in early 1959 to Napoli.
In early 1959 Pegaso had two SVA entries more, the Esso 6h at Vallelunga and the Targa Florio one week later, both with the car now registered in Roma (should be *02028*).
In 1960 he raced GiuliettaSS *00029*, and only once, in the Targa Florio, SZ *00002*.
In 1961 he purchased SZ *00094*, but I found only one entry for him, the Frascati-Tuscolo Trofeo Franco Venturi.
Conclusion: Bettoja sold *01461* in mid to late 1956. He raced *02308* when it was owned by Candida Tupini from late 1956/early 1957 to mid 1958. and he raced *02028* in early 1959 for a very short time. All this would need confirmation.