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Discussion Starter · #1 ·
besides the obvious difference in cubic inches. I have a complete assembly with trans and (S)C8AE 9425 A intake and can't tell if engine is a 390 or 428 any ideas as far as id #'s It doesn't have the GT style heads thx Gary
 

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Discussion Starter · #3 ·
thx. will check out my assembly right now using the guidelines. Gary
 
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