We have been using a rare ’71 455 H.O. Quadrajet on our engine for several years. The casting is void of an outer ring in the primary venturi, and because of that its peak airflow capacity is more than 825 cfm. We returned to the stock calibration of 0.074 jets, 43B rods, BP (0.041-inch) secondary rods, and a “G” hanger for the initial pull. It proved a bit rich. Peak power was attained using a pair of CV (0.0527-inch) secondary rods and an “R” hanger.