Radiator in front?

Jeff, here's the fix for your question - but it won't be inexpensive to do.
All you have to do is major bodywork to change the hood on your Valiant to incorporate features similar in design to the Shelby Series 1.

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The cooling air comes in the front of the car, through the radiator and is then ducted up and out of the engine bay through the front part of the hood. This also generates quite a bit of downforce at the front of the car.
As long as you're doing a little "minor" metalwork, you could incorporate a cowl-induction type hood scoop to pick up cooler air from the high pressure area at the base of the windshield. In fact, all that air flowing out of the front of the hood may increase the amount of air available at the cowl.

Simple, right?
Now that's a damn good answer!