I dont have any info on that carb number...a phone call to Holley...heck I would and that would get an answer I bet.
I do know you dont want bigger than 350 cfm...I run one that is that size, a stock 2 barrel for the 230...before we put it on, we measured the intake openings and figured the cross sectional area...it is so close to exactly the same at the throttle plate opening cross sectional area that the diference is not worth mentioning...anything bigger is a waste.
Lord send your Holy Ghost into our hearts and make the desire of our hearts Your Will.
Pro-choice, that's a LIE, babies don't choose to die!!