Can you identify this small block Chevy

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HMFIC

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HMFIC

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The "S" means it was built in St. Louis I believe.

The "A" body is going to be a Chevelle, Malibu Concours, Estate Wagon, Nomad, El Camino, GMC Sprint, Laguna, or Monte Carlo.

According to everything I'm seeing, it's a 145hp 2bbl carb.
 

Rooster1971

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Yeah, the casting number will help determine if its a 4 bolt or not. It's probably not coming out of a 1974 a body, but you never know. Seems like alot of the truck blocks of that era were 4 bolt mains. Had a 75 truck block in a 69 camaro that was a 4 bolt. What's the head numbers??
 
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