With efficiency that stems from years of experience, Tony McAfee and Jeff Lake had our street-friendly 427 test mule strapped down and hooked up in the dyno cell in short order, plumbing it with a set of Kooks long-tubes with primaries large enough to take advantage of the heads' cavernous exhaust ports. To be honest, little time was spent "perfecting" the combo--it wasn't necessary.
We started with a 650-cfm Demon carb, made two or three pulls while experimenting with ignition timing (the combo seemed to prefer about 31 degrees total timing), then bolted on an 850 Demon for a couple final pulls. As you can see, the result is oodles of torque and better than 1.4 peak horsepower per cubic inch. This is excellent performance from a naturally aspirated bullet with pump gas-friendly 10.5:1 compression and civilized cam specs. Equally important, however, is the longevity that can be expected from the high-quality components and fastidious assembly of the Dart 427 short-block.