Anyone recommend a direct exact fit replacement aluminum radiator for a 1971 Z28. I want to keep the stock fan and two piece shroud and have the top cover fit right and the radiator sit in the core support properly with the rubber bumpers. Exact fit replacement. I have a big block 70 SS that is on it's 3rd al radiator (Champion CC162, Griffin 33-145985-1, Afco AR80255N). None fit with the shroud. Thanks for recommendations.