I don't believe the lift hooks were meant to be left on the 351w Shelby engine . Partially because it was a engineering directive (that evidence shows sometimes don't get followed) and partially because they detract from the ornamental look of the engine. From a detail finding concours standpoint they are cool but they do not do anything to enhance the look of a GT350 engine IMHO. They are easy to get to and remove unlike the hidden GT500 versions.It wouldn't take much motivation to remove the GT350 versions. I have seen numerious installed on non Shelby 351w engines. I at one time advocated installing them but some years ago reevaluated my position given the fact that I have not seen any engine lift hooks installed on any year GT350 that was unmolested . I had to come to the conclusion that a strong effort was imposed to take the engine lift hooks off of the Shelbyized GT350 engine and that any few that slipped through un removed was a anomaly not relevant to what one would see normally in production. I wouldn't want to add something to my engine that I didn't have proof came on it originally unless I was reasonably sure I was showing what one would see in normal production. I would hate to see a feature that wasn't normal production replicated on every car without further study. Just my opinion. Bob