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The test bed for our Holley EFI versus carburetor showdown is this 454ci big-block Chevy. With a two-bolt block, stock crank and rods, Sterling 9:1 hypereutectic pistons, a .549-inch/.558-inch lift Lunati Bracket Master II cam, and large oval port iron heads, it's a good street and mild race motor. Perched on top is our carbureted system, consisting of a Holley 750-cfm carburetor (PN 3310) and a Street Dominator dual-plane intake manifold. The 750 was treated to a secondary metering block conversion with number 80 jets and a 4.5 power valve.