We need to know what you want from your boat? I also would also rethink using only 600cfm carbs on that aggressive of a motor. Ask MPD, I did . I switched from 600 to 750's and gained 500 rpms and power all over the range(holeshot, Midrange and top end). You cant think of the carbs on this motor as in a car,be cause I know that 600's are fine for a street car, but for a boat that will be under servier load and constant rpm's the 750's work great. Also do you want to go with a Roller Cam, Solid, Hydraulic???