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need years and casting numbers of GT-40 heads on stock production mustangs and if cast iron intake and exhaust will bolt onto these heads?
 

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Cant give you numbers, but the GT40 iron head will fit any small block ford app. 221 to 351 windsor, that is physically, there are some comp. ratio concerns if you put these on early motors, all the stock intakes and exhaust manifolds bolt on just fine.
 
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