Steve, since you have to run a normal cooling radiator, consider the air/air cooler in front of the rad, and downstream an air/water charge cooler where you had planned the original. Ice water tank in the bed of the truck, and its good to go. I used that compound type system on the Merk, and with water spray on the air/air, I found it to be VERY effective.
To keep it simple for this year, just do the air/air, while thinking about what change is next. spray nozzles, air/water etc.
You can't put a value on GOOD AIR