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In 1955 on the small blocks.
Not really 4 bolt.The pump uses 2-5/16"bolts(with 7/16" heads) to hold the pump to the block thru the fuel pump mounting plate which uses 2-1/4" bolts to hold it to the block.The plate is to allow access to the fuel pump push-rod which is driven off the cam.
Mike.:bowtieb::)
 
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