Hotcrusader76, do you think adding metering blocks,and lengthening the fuel transfer tube obviously, is the hot set up for the 660's? Buddy of mine has a pair on hie 468 V-Drive flattie. Going to go through the carbs and I've been told that the ability to jet the back of the 660 really helps on the tuning, much like a double pumper. You don't have to be square. Also i saw you mention changing over to the 850 base plates help also??? He's got a lot of slop in the throttle shafts now so that could be an option also. Do you commercially do carb work?? Thanks for any info......!!!