Hi mr T, was that spring originally a herald or spitfire spring? On the cooling side have you put any ducting in to guide air from the grille to the rad? If not i think you're getting a high pressure zone in your entire engine bay, stopping the flow throug h the actual radiator. I think this as u say only temp prob at high roadspeed. At least u need some kind of tray at the bottom linking nose to radiator, probably with a downwards lip. Look at some pics like australian ford falcon undertray. It creates a lower pressure behind the radiator assisting flow.
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