I know the #8 and #9 Avanti's still exist. The #9, which took the records, is in California. The #8 car is in a shop less than ten miles from me having its engine rebuilt (unfortunately, while a genuine R3 engine, is not the R3 it was equipped with at Bonneville). The third car could be the Due Cento, which does still exist, or it could be the Sears Allstate promo car Paula Murphy and Barb Neiland ran coast-to-coast and was driven on the Salt Flats as well. There could also a different car for all I know. Whether the Allstate car still exists I have no idea. Maybe someone else can answer that.
Poet...Mystic...Soldier of Fortune. As always...self-absorbed, adversarial, cocky and in general a malcontent.