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If its original 4spd 12 bolt 67 it should be a pretty rare car.Is it a 327 or 283? I am not familar with factory block casting numbers
 

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It is a 327, 300 hp 2 bolt. Casting 3791362 comes up as replacement for 3790721 which is a 283 for a chevy II. Maybe it was dealer upgraded?
 
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