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i have the numbers matching block for my 70 ss396 car,but the heads i got with it are older 325 horse ones, what would be the correct casting for my november of 69 car?
 

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Agree according to my resource. Resource also states this head casting had both spark plug types even with matching casting dates. I'd look for a pair with close casting dates and ensure they have the tapered 'peanut' plugs.
 
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