AC made rebuildable fuel pumps like the one pictured for small block & big block Chevrolets. GM part # 6415325 is for the Corvette HP small block & # 6415748 was for the Corvette big block. These fuel pumps were recommended by Chevrolet for racing usage back in the day. I believe the only difference was the fuel pump arm (lever). Big Blocks were usually stamped either 40170 or 40731, Small Blocks had the metal tag with the stamped number. Small Blocks had the cast aluminum bottom cover as shown, Big Blocks had either the cast cover but more often had the stamped steel gold iridite cover. Don.
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