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The as-cast AFR 305s were definitely worth the effort and expense after realizing a peak-to-peak power jump of more than 53 rear wheel horsepower. At 6,200 (we let up at 6,200 for the baseline) there was an additional 82 rear wheel horsepower. Starting with the Part 1 baseline (329 rear wheel horsepower) to after testing the six upgrades (cam, intake, carb, spacer, 18 volts, and heads), the 454 picked up 126 horsepower to the back tires (455 total). The total combination (especially after the head swap) produced a powerband that kept pulling up the rpm scale after the stock heads had power dropping.