[rsrose]

Here's what Google says to the following question, Does the 1962 GMC V6 with a mechanical fuel pump require a spacer between the fuel pump and the block? "Yes, a 1962 GMC V6 engine with a mechanical fuel pump typically requires a spacer (often phenolic or plastic) between the fuel pump mounting flange and the engine block. This spacer helps manage the heat transfer from the block to the pump, preventing vapor lock, and sets the correct operating depth for the fuel pump arm to prevent over-pressuring the carburetor."