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Although this type of engine was pretty non-responsive to carb changes, depending on what application you are going to use it in (manual trans, automatic, heavy car, etc.) you could get away with a number of different fuel meters. For the dyno session Bob chose to use a Carb Shop-prepped 650-cfm double pumper. However, a vacuum secondary 600 would probably be just as responsive and perhaps even save you a little on the gas bill.