I'd go for the money a Demon 750 Annular booster in the Mighty Demon.
If its for strip primarily it's the way to go. If want to buy the
Ultimate carb only on get the Race Demon RS can be from 575 to 1050 cfm.
Just change sleeves and base plate to your size if needed to change the baseplate at all. If you ever want to go big on another combo you
Already have the carb. 8)