[gumby79]

Look into a dual pass radiator. Referenced in this article. Aero-tuning the Championship-Winning NASCAR Dodge Trucks

Julian Randles at J&P Motorsports came up with a good idea, which was a two-pass radiator — it had two cores, one behind the other, but all in one radiator unit. You pass the water in the back part of the radiator, and then you fed that through the front part.

You took as much heat energy out of the cooling water as you could, using the minimum amount of air, so you could run a smaller radiator, which meant you were letting a lot less air into the engine bay. This meant you were not giving as much lift to the engine bay and had less frontal lift in the car.

They reference a shop in the US But any reputable Australian shop should be able to do the work .
For you its more about being able to pack as much cooling into the least space(less air doing the same job=less drag) = the most body mod with out compromised cooling. The custom aero hood has more freedom to take the best shape possible to get more productive results ,less cd.
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redpoint5
The US Army HMMWV has a tilted 45° radiator with conventional core.
Air passes through the radiator because of pressure differential, not ram force. Ram can be counter productive. Diverging/Converging Radiator Ducting - Why?
The sudden change of direction increasing pressure in front and decreases pressure behind resulting in a larger pressure differential.
A neet aerodynamic trick would be to duct the energized air into a low pressure zone behind the wheels, brake of the hood.

http://ecomodder.com/forum/showthrea...e-29689-2.html
A link from that thread I found interesting from FSAE.COM.
Diverging/Converging Radiator Ducting - Why?