carb choice and slick size

I agree with these guys. They have good reasons behind the choice.
While a Carter isn't a strip carb by design, most Holleys are not a street carb by design ethier. They will work great. Ethier one. Carter's can perform!

The difference between the carbs CFM sizes, 650 vs. 750 is just a few HP. You'll not see it at the track in a big way but you'll notice a much better throttle response on the street.