Had this discussion with a friend about the difference in performance of efi and carbs and he told me about his mate who went from a well tuned Rochester Qjet to an expensive injection system and only gained 3 foot pounds of torque in the mid range and nothing at the top all measured on the dyno. He did say the only real benefit was when starting it cold it idled better. From memory it cost him 3K to convert over so not exactly bang for buck.