Which heads are better for all around jet boating, square or oval port for 454? I believe square ports flow more air and work better once the rpm's get going but I think oval port will build rpm's faster. If I'm wrong let me know. I want something for pulling skiers, cruising and maybe hit 75 mph on occasion. I can taylor the other engine parts accordingly. What I'm trying to avoid is a sluggish motor at lower rpm's. Any and all advice appreciated.