I get asked fairly often "What size carb should I run on my ________ engine?", and it's a question that pops up on this board from time... so I figured I'd offer up my time-tested, rule-of-thumb 'formula' for all to use... Double the engine's cubic inch displacement. That's it, really. Honestly, it works out perfect for almost ALL street/strip applications. A 350 engine? 700cfm carb. Got a 302? 604cfm. 454? 908cfm. Obviously, a little rounding up or down will be in order...usually to the nearest 50cfm incriment to be able to buy a commercially available carburetor in the required size, but I've used this method since high school and it's always served me well. Hope it makes your next carb purchase a little simpler for you, too. Merry Christmas!