Ok it looks like I will be changing the clamps, but I am still curious about where Mr. Mannel got his information. Do you think that only the Shelby's used the flat clamps or all 68 Ford products. Do you think when the recalled 68 Shelby GT350 and the latter ones with Holley carbs got the flat clamps. Our car is a 12-02-67 car that still has the cast iron intake manifold and Autolite carb.