I have twin 270hp Crusaders. 2007 with 4 barrel carbs. I'm am curious about converting it to a throttle body fuel injection system, mainly for fuel efficiency reasons. What are the pros and cons? A mechanic told me it would cost about $10,000 but I've seen kits for between $800 and $2,000. Sounds like a lot for labor. Is there a difference between kits for marine applications or would an automotive kit work?