No, I have not used Braswell, because I just can't see spending double the price of an off the shelf unit (or in this case, over double the price). I built my carb and tuned it myself. A wideband helps, but is not required.
By the way, there is nothing wrong with off the shelf cams and carbs. I really don't understand why some folks think you MUST have a custom cam or carb to make your car go....it absolutely baffles my mind because its just plain false. Throwing money at a problem is a way to do it, but its not THE way.