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The 668 is a very user friendly carb. You will not gain much out of the other carbs. I have done a lot of reasearch on carbs. From what I found 50% of the people that tried a 813 like it and the other 50% did not. From what I was told they are more finicky to tune. Most agree the 990 is a better carb but does not have a choke or pump on it like the 813. Like some one said the 990 is the same as the 813 other then the 813 has a accelerator pump. I was told the 990 is easier to tun then the 813.
Right now on all my engines I am running a 668 but did pick up a 990 I am going to try.
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