I would gues-timate a zero gain...... With the inter-cooler you are cooling down air that a turbo has heated up. Ambient temp is used to do this. I guess if you put the cooler in a bath of ice or dry ice it might help some. Other wise you would be using ambient temp air to cool ambient temp air. Kinda chancing your tail.......Would You See Any Difference In Power If You Added A Intercooler To You Intake Setup To Cool The Air Even Though You Don't Have A Turbo Or Supercharger
Actually Randy has a good point...A cold air intake will give you about 2 tenths in the quarter.
Coating the inside of your intake with epoxy is worth another 2 tenths. If you don't want to go to that amount of trouble, laying a bag of ice on the intake for 10 minutes or so will give you the same improvement.
Anything more elaborate than that, and you might as well put a shot of nitrous on the car.