I have a 89 23 ft cabin cruiser weighs 4500lb that I would like to add little more power to. Boat has 260 hp 5.7 mercruiser with cobra outdrive. Boat runs bout 32 ish but I would like to see 40 + if possible. Motor is stock but what are good investments for creating more power on the water. I'm mechanically skilled as I've drag raced for yrs. I assume Cam, heads, carb, and exh are good places to start? Any recommendations???