...I am trying to select a prop for a boat I just picked up. It's a 1969 Arenacraft with a 352 Interceptor (250HP), 1:1 velvet drive, a freshly tuned mallory single point, a Weber 600CFM freshly set up, and a new-old-stock 13X13 prop with virtually no cupping. No idea what the boat weighs. I get...