I just want to give a shout out to C&J engineering for a great job sorting out my carbs. I built my 565ci bbc four years ago and after getting what I thought were good dyno numbers (950hp @ 6700rpm) my boat ran like crap! After trying everything else I sent my carbs to John at C&J and what a difference. I couldn't be happier. If you're having issues with your carbs, call C&J.