[Power Surge]

Carb CFM formluas work okay for out of the box basic carbs, but nowadays there are so much better "prepped" out of the box carbs, than the standard Holley ones.

My advice, would be to decide on a brand of carb, and then go over your engien combo with them. For example, DeMon carbs discourages people from buying their carbs based on cfm rating, and prefers you call them with your engine and vehicle info so they can suggest the proper size and model.

But for the "general" rule of thumb people look for, my experiance is that a 750 is good for a mild street big block. Something hotter or a stroker will like something more like an 850. Full boogie big blocks will want something bigger, like a 900 or 950. I have no idea why you seem to be favoring a Dominator, that's a drag race application carb and really not that great for street use. As a matter of fact, Holley makes (or used to make) a 750 "street" Dominator for those who wanted the "look" of a Dominator without the drawbacks of using a real race version on the street.

But again, carb technology has come a LONG way in the past 5 years. Most of the carb specialty shops can set you up with a smaller "cfm" carb that will vastly outperform a larger out of the box carb.

My ultimate suggestion, would be to get a carb from Pro Carbs (I think they are now a vendor here as well?). I have been most impressed with their work and knowledge over any other carb company.