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'81 FWB, '99 Century
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From what I've heard, a 472/500 intake is a slight upgrade for a 425. There are people that sell them ported. If you go to an aluminum one like a bulldog or an edelbrock I don't think the long a/c compressor will work. They are 3" taller. MTS sells brackets for a/c compressors specifically for that. I'm not sure which compressor you have to use though.
 
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