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Hi Gang. I have to pick between 1970 or 1971 factory ex manifolds for the 351 4v build up. This is going in a 69 ( I know.. not right !!). Will either work? With the 1970 casting I can use a factory H pipe.. but if I get the 71 style will the 71 H pipe work? I don't see why not. Let me know your valued thoughts please. .. Thanks - Mark
 
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