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They are the SAME block. 2 bolt block used in the 302-350 engines.
Jeez, what is up with people selling these parts???

I should pull the 657 block out of my 67 RS and sell it as a 1967 302 Z motor. Yeah, that's the ticket.
Rick H.
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Welcome to Ebay. The most deceptive market in the world!
Hope you have deep pockets and buyer beware!