An A is plenty big...if it is an A prepped and setup by MPD. Marine Performance Designs. Jack sets up pumps so tight that they are almost as efficient as a prop. For example: My Daytona 21 runs 85.5MPH (GPS'd) at 5100 RPM With a MPD prepped Legend A in his Stage 3 pump setup (Berk JG, Droop, Place Div. with insert nozzle, stuffer and prepped and flowed bowl). 6-71 running 1:1 462 BBC.