You don't need to fit a swirl pot if you have carbs - the float bowl of the carb itself fulfills the same function. Tanks for racing usually have baffles fitted though to avoid fuel starvation on long curves. All tans need some sort of venting so that you don't build up a vacuum and stop the fuel flow. My Westfield tank has a one way valve with a breather pipe exiting out of the bottom of the car. Production cars seem to have a pipe that comes back up to the filler.
Enoch
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