lot's of theories out there but i must agree with VENTURI size.
not carb size..
but then you toss in the booster..some boosters are capable of great atomization in a large venturi.
I have a 750 double pumper that has dogleg boosters ..all tweaked of course..will flow way over the rating..
I have installed it on a car that had a 670 street avenger..and 241 gears.
Funny how dialing in a carb means more than the size sometimes..
That car was much quicker all around..and snappier throttle than the smaller 670..
I never ran dominator size venturies so i cant comment on those..
If i need lot's of cfm i go with 2 carbs.
Then tweak them all till there is no more tweaking left to do to them.
People that just bolt on a carb and never really dial it in perfectly , will never know the real story ...
I am talking more than just jets and squirters and pump cams.
get out the pin drills and epoxy and grinder.
Largest i ran(on a small engine) was a 750 on a 240Z..was the largest i had at the time..
ran awesome..that is 2.4 liter. big cam ported head.
shift at 8500..with the 450cfm she would go 6500 and peter out.
22.5MPG is what it got with either carb.
Ran a 600 ?afb early buick on a 280z with 260 head in a 260Z with a home made 4V intake..27MPG..
These guys runnin 600cfm on a 350 tickle me..I guess it works for daily driver ...max R's and power i like more..
1200cfm on a 350 ran awesome..but done it with 2 600's
650cfm on 2.3 pinto's..they loved it..
we are talking RPM potential here.