Zetec Carbs 32/36 DGAV or 38 DGAS?

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I am planning an 1800 zetec for my mk2 fiesta, carbs of course but i have 2 options. 32/36 DGAV which is already on a manifold for a zetec or a 38 DGAS which i presume will go on the same manifold. both will need a refurb before going on but id like some advice on the pros and cons of each carb. any help gratefully accepted...