Moto Guzzi saddled us with this confusion. The Daytona were inscribed "4V", in contrast to the other BigBlocks which were
"two valve' (per cylinder or per head). So, yes an eight valve engine, 4V per head.
The next generation 1200 engine for the 1200Sport, Griso, Stelvio, Norge were "Quattro Valvole," again, per head:
(Early 1200 offerings were still two valve/head.)
Seems that after all the early 1200 "4V" valve train failures, the bikes started being called "8V", even though the motor is still the "Quattro Valvole."
As I am in no way an expert on post-V11 Moto Guzzi, I invite clarification from those more familiar with the later (1200) nomenclature, as well as the Original Poster with his fabulous Scura on offer.
[Also, GuzzBun, I will take this post down if you prefer.)