[rotorwrench]

Mercury and Ford are similar. The question mark tube attaches to the timing cover with a clamp & bolt on the left side and is the same part for all 8BA engines. The lower draft tube for most Ford engines has a downward bent about 10 inches up from the bottom and the Mercury lower draft tube has only the slightest bend near the bottom end of the tube so the whole thing will clear the big cross member.