Which carb would you get?

Leo, far away is not a problem, as long as it's in Canada. LOL Going across the border is getting to be a pain. I am about as big as I want to get cam wise with these heads. Any bigger and I would be into new springs and cutting the spring seats. The CFM calculator I used said I should have a carb with 758 CFM. I am not sure about the speed demon as I have heard they are rated a little different.

Jack