Actually room between the radiator and intercooler wasn't my concern based on the picture; it's 1) allowing a big enough volume of cool air to hit the entire area of the intercooler and 2) having a big enough radiator to deal with the fact that the air now entering it is going to be MUCH warmer having just come through the intercooler. Did you run some heat transfer numbers to see if you've got enough radiator capacity for sustained high speed running? As you seem to know, the cooling issues are entirely different for sustained high speed running than they are for street/strip use. Looks like it's gonna be fun though!