I have the same boat, 5.7 with Bravo 3 Drive. I would like to do the same thing you did in a year or two. I love the boat. MPG isnt bad, but I would love more cockpit room, bilge space (I really want to add a Rhodan GPS Trolling motor and need 3 more batteries. We use the boat primarily to dive out of. Lots of gear and lots of heavy tanks. Do you thing it could handle a 350 and would it be worth it?