Centerforce does indeed make an 11" clutch cover that will bolt on, but you have to ask for it. Most 'kits' sold for the 351C are 10-1/2" Mustang units and require either a new flywheel or a careful redrill of your OEM flywheel. As an added benefit to the diaphragm type Centerforce, you'll find a much easier clutch pedal with the same holding power as the 3-finger Long clutch.
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