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Having the air dam would create a region of positive pressure in front of it. On my old car I drew cooling air from the lowest point, but that was the very bottom of the existing bumper which had a splitter like element. If you could incorporate a splitter type element to your air dam I believe it would increase the pressure in that region. Note that this is all based on my limited interpretation of drawings/text in Hucho's book.
Part of what I did to make mine work on my old car was to direct the pressurized air to the radiator in a semi-sealed up duct. Stock, there were many ways that the air could enter the bumper but go around the radiator. I don't know how your car is in this regard, but if you are collecting this air I would want to direct 90+% of it right to where it was needed.
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