Some QJ negatives: Most manifolds need an adapter, and these typically have very narrow gasket surfaces and are leak-prone. QJ has small bowl capacity - harmless in an L6. Tuning the secondary needles by hangar letter is pretty tough to learn - I'm still fuzzy on the effects so I work around it. There are several combination of primary MJ + metering rod that provide very similar cruise mixture for a specific engine, and as many as your patience permits should be compared. The fuel inlet fitting is easy to strip - common cause of cheap price.
