I assumed that this part was used in the 308 QV since the Lancia-version is almost equal. The only major differences I know of is the 90 deg. crankshaft,smaller valves and different firing order.
The fuel injection should be the same I thought. Apparantly not.
I have the workshop manual for the Lancia. It states that the regulator should regulate against atmospheric pressure. Which several mechanics dispute...
I am sertainly not sure what to think.