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Holley carbs like to run level rather than pitched forward via the 4* power angle built into most intakes. Since most Cobra engines are installed relatively flat in order to keep the bell housing from scraping the ground there are two remedies for this situation: 1. have the carb mounting surfaces milled flat, 2. use a wedge. Many marine supply houses stock 4* wedges that will level a carb. I have heard that Shelby himself used these items in the early cars to level the Holley carbs. The wedges usually do not add much to the height of the air cleaners and do work very well. Either way, Holley carbs perform best when installed relatively level. Adjusting the float levels can help somewhat but it is always better to level the carbs for best performance. For example, Moroso part #65030 is a 5* wedge, expensive at $39.95 each from JEGS or Summit, but probably less expensive than pulling the intake and paying someone to mill it down.
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