Considering a Beta 20 hp diesel as a repower engine for my daughter's 1982 C-30. It currently has the original 5411, 2-1 reduction gear, 3000 rpm, and a Gori two blade folding prop, 13 x 9 rh. With a clean bottom and WOT and no wind or current it will hit 5.4 kts GPS. My question is will a Beta 20, 3600 rpm, 2-1 reduction gear and a 3 blade fixed 13 x 9 prop (recommended by both Beta and Catalina Direct) achieve hull speed of 6.7 kts? Thanks, Mike