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7a.We went with a Holley Street HP Series 650-cfm carburetor to meter the air and fuel for our LS. The Street HP carbs offer many of the features of the high-end Ultra HP carbs except for the billet metering blocks and base plates-for about half the cost. Our favorite features of the 4150-style Street HP carb include screw-in air bleeds for fine-tuning the fuel curve, contoured venturis for increased airflow, and idle mixture screws that won't vibrate loose from the metering blocks. You also can't go wrong with the new shiny finish of the Street HP, and the Dominator-style float bowls add the capability to plumb your fuel lines from either side of the carburetor.