Cracked the block on my etec 60hp 16ft dragonfly emerger. It used to struggle getting on plane even with the two stroke and a four blade prop. I'm worried that the yamaha 60 hp wont be enough and that I should get a 70hp (the 70 and 60 are the same weight). I think the skiff might only be rated for a 60 but it is not explicitly stated on the skiff or the website. Any Advice?