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13s are extraordinarily sensitive to excess engine weight. Hanging a bloated 30-40hp 4-stroke off the back of one is a recipe for an underperforming combo compared to other similarly sized and powered boats. I would strongly encourage you to consider a 25 hp Etec. It's light weight and "torquie" power profile will make for a package that is lite, easy to handle, and nimbly responsive. You can certainly pay more money and toss more hp on a 13, but once you start exceeding the recommended engine weight the gains really drop off and the boat just doesn't ride as well.

Edit: Sorry, I didn't see you already purchased an 40 Merc. Best of luck to you.