I've had no complaints with my daily driver with an F cam. Just don't run under 1,500 too often or it'll buck slightly. (nothing major).
The X cam is simply a B cam with more lift. At least in the Ford catalog anyway.
If you can afford to, and have access to, get a custom cam for your combination, then do it. It'll be much better than an OTS cam. For a carb'd setup, I'd say the X since its so close to the old carb'd ford cam, the B.
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