Since you are burning alky, you don't need a chiller, or cooling, alky burns better, ie more HP the hotter the motor. With my all iron SBC, I like to get the heat up close to 200°. At our last Heritage JrFuel race last week-end in Phoenix we were 195+ while staging and as high as 217° after the run, with water in the block & heads. We were low qualifier at 7.14, 187 mph. You may have to lean your barrel valve to build that kind of heat. We found running with out water HP goes down about 20hp, [ per dyno testing] we think because the water helps even out the temps, of course, but it also helps keep the harmonics down around your cylinders, which means better ring seal.
Besides a chiller just adds more weight to your car, and might create a leak one day, keep in mind the old school theory 100 lbs = .10.
When we are called to the staging lanes, we warm the motor up to arond 180° and then put a blanket over the engine for the staging lanes.
Good Luck with your project,
Jon