What I have done in the past is to aquire a set of 351C headers that fit the car I am working on (Mustang/Cougar) and after removing the flange and appropriate amount of tubing, I graft on a 289/351W flange and tubing; depending on the price of the Cleveland headers it saves $$$, but not a lot of time as it can be labor intensive. The reason for this is because 351C's come in such a variety of tube diameters (1 3/4", 1 7/8", 2", & 2 1/8") as compared to the standard early Mustang header. Plus, by using the wide three-inch head bolt pattern, hard to get to bolts are a thing of the past (normally). These headers that I "modify" are made for the track and not necessarily for the street. I agree, if the price came down a bit, I would be far more interested. But then again, time is money.

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Racing Cougars (the other Mustang) for two decades...