He adopt the BOA Heads on the 4,0 OHV engine.
As i told to the ingenieur who develop the 2,9 to 4,0 and to sohc, he told me that thy casted a few blocks (like5 pieces) and adopt the BOA heads also by cosworth.
This engine makes over 300hp in a early scorpio.
Never seen it.
I still wait on...