Nate, I like the idea, but I belive it would work better with an air to water chiller. Using the AC to cool a few gallons of 50/50 and then run it through an air to water intercooler when boost is being made. It would be able to sustain a little longer than chilling an intercooler that is exposed to a constant stream of air.
Also, with 50/50 and a good compressor, condensor and evaporator, you should be able to get that mix damn cold.