You should use an electric fuel pump. Using a regulator on the factory mechanical pump will eventually kill the pump. My recommendation is to use a Carbole 42S electric fuel pump from ebay. They're cheap to buy and are identical to the Mr Gasket 42S fuel pump, only less than half the price (they are the same pump - the model number on the body is the give away) They are a high volume, low pressure pump which is what you need to run the Weber carb. Easy to rig up. You don't necessarily need to remove the mechanical pump but you can make your engine look less cluttered by taking it out and using a block off plate.