Yes, amazing car. Nicknamed "Flounder" as they called it...
It was at least 65HP down on the Ferrari 312PB but the titanium chassis and other weight savings supposedly made it the lightest in class. The car was really designed to win the Targa and the 'Ring'. It accomplished both if I recall correctly.
I saw it up close at the Naples FL. Revs Institute.
Here is a 908/3 in action. This is the original development chassis so it has the headlights. The Flat-8 sounds amazing!
https://youtu.be/NHIBPb2zkIc