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What is the difference between these two LH manifolds? I have a '69 427 COPO. I see that the correct LH manifold for a 427 COPO is 3909879, but I am assume that 3914613 will fit as well?

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This is what I found
613 fits 68-69 passenger cars. The correct numbers for Chevelle is 3909879 and 3916178
and if it has holes four holes in the tops its a smog one .
 
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