G'day mate . I run a 750 Race Demon and they are a pretty good out of the box carb. Need a few tweeks hear and there but still good to start with. I have a mate running a 650 Mighty Demon on a 308 cub holden with a 100 shot on it and he is running 10.3's on the 1/4 in a 3000 pound car and his is out of the box !!! That should say enough !!!
Yes, as in say the 750 works, then you change to a bigger cam that requires more cfm you can turn the carb into a 850 for example, save buying a different carb every time you change something, i'm on my 4th now.
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