I'll cut the quiz short, because it's a trick question. You can't have a flat plane (180 degree) crank with a V6. Nor the cross plane (90 degree) crank that all American V8s use (except the Voodoo) for that matter. Because, you would have wildly uneven firing intervals. To get the 120 degree firing order from a V6, you need spaced crank pins. And balance weights on the crank, if not an additional balance shaft to quell vibrations from the inherently unbalanced design.
The Dino had offset crank pins. The AR Giulia QV 2.9 V6 is often called 3/4 of a Ferrari engine, which is pretty close, but the crank is not 3/4 of a Ferrari flat plane. It too has offset crank pins.
Someone may yet find some obscure oddball V6 that attempted a flat plane. Probably everything has been tried once.
I'll wait for the mechanical engineers who actually completed their degrees to correct me.