I recentely completed an engine swap in a 73 Sanger flat. I built a blown 496 low boost motor to replace the stock 454. I also installed a turbo 400 trans. I ordered 1.37 gears to replace the 1.18 ratio to pick up more speed. Estimated h.p. is 850, about 400 more then I had. Will the new motor handle the 1.37s and how much more speed can I expect at the same rpm, about 5800? Also, what happens when a 11 1/4 x15 2 blade prop is replaced by a 12 1/2 x 15 3 blade prop in the same boat. I am new to this forum but have enjoyed reading your comments for quite a while. Thanks!