I have a 1968 L71/L89 without power steering or A/C and my water pump belt is too big by just a fraction. I thought I had the wrong pump pulley so I changed the steel pulley (GM 3921923BM) with the cast iron pulley. They are the exact same size and I'm assuming the iron pulley is correct?
The belt I got from Quanta is GM 3935420 300X3250. I have a 3 groove pulley on top for the alternator, water pump and smog. Thanks if you can steer me.

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