Have you looked at the angle that would need to be at? To me it looks like it would be a big flow restriction. The more I think about it the more I think running twin radiators on the sides is a good idea. You could even duct the air out the sides afterwards, like on the 2006 Impreza WRC:Oh! and as for the radiator, it's simple. Just build an airdam down off the underside of the hood with a rubber seal that follows the line of your radiator's leading edge.